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[58] Investigator said there could have been more fatalities if the pipe had been fully cleared and/or if the wind had changed directions. This arrangement leads to the sp3 hybridization of H2S molecule. Although very pungent at first (it smells like rotten eggs[40]), it quickly deadens the sense of smell - creating a temporary incident of anosmia[41] - so victims may be unaware of its presence until it is too late. Hydrogen sulfide is slightly soluble in water and acts as a weak acid (pKa = 6.9 in 0.01–0.1 mol/litre solutions at 18 Â°C), giving the hydrosulfide ion HS− (also written SH−). Residents living in the area were urged to stay indoors by the emergencies ministry. Treatment involves immediate inhalation of amyl nitrite, injections of sodium nitrite, or administration of 4-dimethylaminophenol in combination with inhalation of pure oxygen, administration of bronchodilators to overcome eventual bronchospasm, and in some cases hyperbaric oxygen therapy (HBOT). This record has not been tagged. Chemists and chemistry students, industrialists, and environmental planners will find this guide to sulfur helpful. Lecturers in chemistry and researchers in the many fields of application of sulfur will likewise benefit from it. Whereas, the lines represent the bonds in the compound. [18] Hydrogen sulfide is also known to increase the levels of glutathione which acts to reduce or disrupt ROS levels in cells. In these analyses, heavy metal (and nonmetal) ions (e.g., Pb(II), Cu(II), Hg(II), As(III)) are precipitated from solution upon exposure to H2S). USEPA; Health and Environmental Effects Profile for Hydrogen Sulfide p.118-8 (1980) ECAO-CIN-026A, International Union of Pure and Applied Chemistry, digestion of organic waste from agriculture, National Institute for Occupational Safety and Health, "Hydrogen Sulfide - PubChem Public Chemical Database", "Hydrogen sulfide: Physiological properties and therapeutic potential in ischaemia", "Superconductivity record sparks wave of follow-up physics", "Why Does My Water Smell Like Rotten Eggs? HCN. H. S is also a precursor for elemental Sulfur. Sulphur or Sulphate is formed once supplied is oxidized. Eye: Frostbite Skin: Frostbite Breathing: Respiratory support, Irritation eyes, respiratory system; apnea, coma, convulsions; conjunctivitis, eye pain, lacrimation (discharge of tears), photophobia (abnormal visual intolerance to light), corneal vesiculation; diz Two out of six valence electrons participate in bond formation. Hydrogen sulfate may also be known as bisulfate. In Uncle Tungsten we meet Sacks’ extraordinary family, from his surgeon mother (who introduces the fourteen-year-old Oliver to the art of human dissection) and his father, a family doctor who imbues in his son an early enthusiasm for ... It exists as the mass 1 isotope (protium, or light or ordinary hydrogen), mass 2 isotope (deuterium, heavy hydrogen), and mass 3 isotope (tritium). [30] Volcanoes and some hot springs (as well as cold springs) emit some H2S, where it probably arises via the hydrolysis of sulfide minerals, i.e. Hydrogen sulfide and its solutions are colorless. [43] These effects are believed to be due to the fact that hydrogen sulfide combines with alkali present in moist surface tissues to form sodium sulfide, a caustic. Draw lines ( for showing bonds) between Hydrogen and Sulphur atoms. [81][82][83][84][85] These first responders, such as emergency services workers or family members are at risk of death or injury from inhaling the gas, or by fire. Bruckenstein, S.; Kolthoff, I.M., in Kolthoff, I.M. Hydrogen Sulfate Ion. For each of the following names, choose the correct formula. J.-H.; Tian, H.-P.; Yang, H.-Y., Determination of sulfur compounds in gasoline fraction of microreactor products by gas chromatography - Atomic emission detector, Petrochemical Technology (Shiyou Huagong), 32(11), 2003, 995-998. ass: Standard non-polar; Column diameter: 0.20 mm; Column length: 50 m; Column type: Capillary; Heat rate: 2 K/min; Start T: 30 C; End T: 150 C; CAS no: 7783064; Active phase: PONA; Phase thickness: 0.50 um; Data type: Normal alkane RI; Authors: Yang, Y.-T.; Wang, Z.; Han. Water heaters can aid the conversion of sulfate in water to hydrogen sulfide gas. This updated edition of the Handbook of Inorganic Compounds is the perfect reference for anyone that needs property data for compounds, CASRN numbers for computer or other searches, a consistent tabulation of molecular weights to synthesize ... An ion of hydrogen sulfite is made up of one atom of hydrogen, represented by H, three atoms of oxygen, represented by O3 and one atom of sulfur, represented by S. The ion has a net ionic charge of negative one. Hydrocarbons can serve as a source of hydrogen in this process.[15]. For other uses, see, Except where otherwise noted, data are given for materials in their, Production of sulfur, thioorganic compounds, and alkali metal sulfides, Hydrogen sulfide in the natural environment. K3P. P261; P280; P302+P352; P304+P340; P305+P351+P338; P312. 50 ppm is the acceptable maximum peak above the ceiling concentration for an 8-hour shift, with a maximum duration of 10 minutes. What is the formula for the ionic compound formed by strontium and fluorine? Dihydrogen phosphate ion. Found insideIn parallel, the book covers newly introduced technologies like bulk data handling techniques, IoT of agriculture, and compliance with environmental considerations. Found inside – Page 1365Acid Formula pKa* Carbonic acid H2CO3 6.35 Hydrogen sulfide H2S 7.05 Hydrogensulfite ion HSO3− 7.2 Dihydrogenphosphate ion H2PO4− 7.21 Hypochlorous acid ... CN-Cyanide ion. In the absence of oxygen, sulfur-reducing and sulfate-reducing bacteria derive energy from oxidizing hydrogen or organic molecules by reducing elemental sulfur or sulfate to hydrogen sulfide. Find Hydrogen sulfide solution and related products for scientific research at MilliporeSigma Hydrogen sulfide also reacts directly with silver metal, forming a dull, gray-black tarnish of silver sulfide (Ag 2 S). Its chemical equation is given by: HSO4– + H2O → H3O+ + SO42-. The sulfide anion S2− is not formed in aqueous solution.[12]. S hydrosulfuric acid hydrogen sulfide HC 2 H 3 O 2 (CH 3 COOH) acetic acid Add the word acid to each name when saying or writing. Synonyms: hydrogen sulfide, hydrosulfuric acid, sewer gas, sulfuretted hydrogen, hydrogen sulphide. Solutions of sulfide salts are corrosive. Catalysts used in hydrodesulfurization are routinely activated with hydrogen sulfide, and the behavior of metallic catalysts used in other parts of a refinery is also modified using hydrogen sulfide. Stable. [90], Hydrogen sulfide is lethal to most animals, but a few highly specialized species (extremophiles) do thrive in habitats that are rich in this compound. J., 20, 2005, 562-566. ass: Standard polar; Column type: Capillary; CAS no: 7783064; Active phase: TC-Wax; Data type: Normal alkane RI; Authors: Tachihara, T.; Ishizaki, S.; Ishikawa, M.; Kitahara, T., Studies on the volatile compounds of roasted spotted shrimp, Chemistry & Biodiversity, 1, 2004, 2024-2033. It is a colorless ion in solution and cannot leave wastewater in this form. Hydrocyanic acid. Found inside – Page 218Ionic Valences POSITIVE IONS NEGATIVE IONS Name Formula Name Formula ... S-Manganese 111 (manganic) Mn++* Hydrogen sulfide ion (bisulfide ion) HS- lron ll ... Molecular Model. [15], Reversibly sodium sulfide in the presence of acids turns into hydrosulfides and hydrogen sulfide; this supplies hydrosulfides in organic solutions and is utilized in the production of thiophenol.[27]. [99], Organic residues from these extinction boundaries indicate that the oceans were anoxic (oxygen-depleted) and had species of shallow plankton that metabolized H2S. Found inside – Page 93Hydrogen sulfide from the anaerobic reduction of sulfate (SO2À4 ) by bacteria usually is the ... sulfate is reduced to sulfide ion (S2À) (Equation 3.31). H 2 PO 4-HPO 4 2-Hydrogen phosphate ion. Found insideIn this book with five chapters, the reader can find some of the latest advances in the biogas desulfurization and an overview of the state-of-the-art research. s.], colourless gas with strong odour of rotten eggs (odour threshold ca 0.2 ppt), yellow powder or fused solid, or amber to yellow crystals. [69][70] A Monroe County Sheriff officer initially determined that the space contained hydrogen sulfide and methane gas produced by decomposing vegetation. The Octet Rule of chemistry states that there should be eight electrons in the outer shell of an element for it to be stable. Review of Submarine Escape Action Levels for Selected Chemicals presents the subcommittee's findings after evaluation human data from experimental, occupational, and epidemiologic studies; data from accident reports; and experimental-animal ... This book introduces beryllium; its history, its chemical, mechanical, and physical properties including nuclear properties. Hydrogen sulfide (British English: hydrogen sulphide) is the chemical compound with the formula H 2 S, is a colorless, toxic, flammable gas that is responsible for the foul smell of rotten eggs and flatulence.It often results when bacteria break down organic matter if there is no oxygen.This happens in swamps, and sewers (alongside the process of anaerobic digestion). Dust may form a flammable or explosive mixture with air.Incompatible with strong oxidizing agents, most common metals, hydrogen, chlorine, fluorine. This reaction is exploited in the Claus process, an important industrial method to dispose of hydrogen sulfide. J.-H.; Tian, H.-P.; Yang, H.-Y., Determination of sulfur compounds in gasoline fraction of microreactor products by gas chromatography - Atomic emission detector, Petrochemical Technology (Shiyou Huagong), 32(11), 2003, 995-998. ass: Standard polar; Column diameter: 0.25 mm; Column length: 60 m; Column type: Capillary; Heat rate: 3 K/min; Start T: 70 C; End T: 220 C; End time: 40 min; CAS no: 7783064; Active phase: TC-Wax; Carrier gas: N2; Phase thickness: 0.25 um; Data type: Normal alkane RI; Authors: Ishizaki, S.; Tachihara, T.; Tamura, H.; Yanai, T.; Kitahara, T., Evaluation of odour-active compounds in roasted shrimp (Sergia lucens Hansen) by aroma extract dilution analysis, Flavour Fragr. Hydrogen sulfide is used or produced in a number of industries, such as. It is also produced in the mouth (halitosis).[31]. Here the valence electrons of Sulfur are used to make Hydrogen stable by donating an electron to both the atoms of Hydrogen. The percent distribution among the three sulfide species depends on pH. Now place two Hydrogen atoms on both sides of the central atom. Thus this molecule shows a bent geometry. So to understand the hybridization, polarity, and molecular geometry of this compound, it is essential to know its Lewis structure. [62][63] Their deaths remained unexplained as the medical examiner waited for results of toxicology tests on the victims,[64] until urine tests revealed that hydrogen sulfide was the cause of death. Each Hydrogen atom has only one electron which is also its valence electron, Hence there are two valence electrons for Hydrogen atom ( as there are two Hydrogen atoms). It is used in the manufacture of chemicals, in metallurgy, and as an analytical reagent. Hydrogen sulfide can also be synthesized by non-enzymatic pathway, which is derived from proteins such as ferredoxins and Rieske proteins. Once the sulfide is treated with a standard acid, it is converted into hydrogen sulphide (H2S) along with the salt of a metal. It often results from the bacterial break down of organic matter in the absence of oxygen, such as in swamps and sewers (anaerobic digestion).It also occurs in volcanic gases, … As the Sulfur atom is less electronegative, the overall electronegativity of the compound is less than 0.4, which makes it nonpolar. Hydrogen sulfide had built up in an upstream tank, which had been left stagnant and untreated with biocide during the maintenance period. Hydrogen sulfide (H₂S) is a colorless gas with a strong odor of rotten eggs. Phosphoric acid, H 3 PO 4, is triprotic—it can donate three protons. Copy Sheet of paper on top of another sheet. As a result, all such compartments are now required to have a ventilation system.[56][57]. The molecule has two Hydrogen atoms and a single Sulfur atom. HClO. If there is a source of sulfate bearing material, such as plasterboard or natural gypsum (calcium sulphate dihydrate), under anaerobic conditions sulfate reducing bacteria converts this to hydrogen sulfide. [67] In an attempt to save the men, a firefighter who entered the hole without his air tank (because he could not fit through the hole with it) collapsed within seconds and had to be rescued by a colleague. Place the Sulphur atom in the middle and arrange its valence electrons around it. In water, hydrogen sulfide dissociates, forming monohydrogensulfide(1-) (HS - ) and sulfide (S 2- ) ions. Found inside – Page F-30... S22hydrogen sulfide ion, HS2 cyanide ion, CN2 acetate ion, CH3CO2 2 carbonate ion, CO322 Parent acid Anion Parent acid hydrofluoric acid,* HF (hydrogen ... [59], In 2014, levels of hydrogen sulfide as high as 83 ppm were detected at a recently built mall in Thailand called Siam Square One at the Siam Square area. At pressures above 90 GPa (gigapascal), hydrogen sulfide becomes a metallic conductor of electricity. Sodium Bisulfate which is the pure substance NaHS0 4 melts at 185°C and begins to lose water with a good deal of spattering. Hydrogen sulfide, H 2 S, is a highly toxic and flammable, colorless gas with a characteristic odor of rotten eggs. Whereas, the lines represent the bonds in the compound. Just hit this subscribe button to get regular updates and a chance of winning this t-shirt. These bacteria cannot survive in air but the moist, warm, anaerobic conditions of buried waste that contains a high source of carbon – in inert landfills, paper and glue used in the fabrication of products such as plasterboard can provide a rich source of carbon[34] – is an excellent environment for the formation of hydrogen sulfide. Treating metal sulfides with strong acid often liberates hydrogen sulfide. Hydrogen Sulfide is a common chemical compound that is useful for analyzing inorganic compounds of metal ions. It also plays a vital role in signaling pathways in the human body. [28], A suspended animation-like state has been induced in rodents with the use of hydrogen sulfide, resulting in hypothermia with a concomitant reduction in metabolic rate. InChI=1S/H2S/h1H2 The toxicity of H2S is comparable with that of carbon monoxide. [54], In 1975, a hydrogen sulfide release from an oil drilling operation in Denver City, Texas, killed nine people and caused the state legislature to focus on the deadly hazards of the gas. Acids such as H 2 SO 4, H 2 S, H 2 SO 3, and H 2 CO 3 are called diprotic because they can donate two protons. General Facts About Hydrogen Sulfide. Hydrogen sulfide ion. These include methanethiol, ethanethiol, and thioglycolic acid.[15]. It has the chemical formula of H 2 S. The molecule has two Hydrogen atoms and a single Sulfur atom. Incompatible with strong oxidizing agents, many metals.May react violently with metal oxides, copper, fluori Having an MSc degree helps me explain these concepts better. [17], Hydrogen sulfide can be generated in cells via enzymatic or non enzymatic pathway. Produced water with a high concentration of hydrogen sulfide was released by the pump. Before knowing its Lewis structure, let us calculate the total number of valence electrons in Hydrogen Sulfide as these electrons participate in bond formation and help us study Lewis structure with ease. When exposed to air, it slowly oxidizes to form elemental sulfur, which is not soluble in water. Hydrogen sulfide reacts with metal ions to form metal sulfides, which are insoluble, often dark colored solids. Found inside – Page F-31Thus , HS is the hydrogen sulfide ion , and HCO3 is the hydrogen carbonate ... the name of the IO - ion and ( b ) the formula of the hydrogen sulfite ion . Sulfur has 2p orbital which overlaps with Hydrogen’s 1s orbital, therefore due to huge difference in energy, 2s orbital would not get hybridized since this process can only occur when the two overlapping orbitals are of comparable energy. Small H2S blooms have been detected in modern times in the Dead Sea and in the Atlantic ocean off the coast of Namibia. It is a colorless chalcogen hydride gas with the characteristic foul odor of rotten eggs. Hydrogen sulfide burns in oxygen with a blue flame to form sulfur dioxide (SO2) and water. Now that we know the Lewis structure and hybridization of the molecule, it is easy to determine its molecular geometry. View all posts by Priyanka →. Short-term, high-level exposure can induce immediate collapse, with loss of breathing and a high probability of death. According to the VSEPR theory, the lone pairs of electrons repel each other, but as the Sulfur atom is less electronegative, the bond angle decreases to 104.5 degrees. In water or water-base muds, the three sulfide species, H 2 S and HS-and S-2 ions, are in dynamic equilibrium with water and H + and OH-ions. In this compound, both the hydrogen atoms require one electron to make the covalent bond with Sulfur. For detailed information about hydrogen sulfide and sulfate in well waters, refer to University of Georgia Extension Circular 858-8, "Your Household Water Quality: Hydrogen Sulfide and Sulfate." Formula: H2S | CAS : 7783-06-4. The critical temperature increases with pressure, ranging from 23 K at 100 GPa to 150 K at 200 GPa. Hydrogen Sulfide in Aqueous Solvents 1. Found inside – Page 269Carbon disulfide has some toxic features in common with H2S. ... However, testing for sulfide ion in blood may help to make the diagnosis for those who are ... High concentrations of hydrogen sulfide can adversely affect an ion exchange water softener. Hydrogen Sulfide is a common chemical compound that is useful for analyzing inorganic compounds of metal ions. H2S, or hydrogen sulfide, is a colorless gas that is flammable and extremely hazardous. The gas is often associated with “rotten egg” smell and can be very dangerous to be around. Hydrogen sulfide is a highly toxic and flammable gas (flammable range: 4.3–46%). In industrial anaerobic digestion processes, such as waste water treatment or the digestion of organic waste from agriculture, hydrogen sulfide can be formed from the reduction of sulfate and the degradation of amino acids and proteins within organic compounds. 5.8 * 10-10. HS − Hydrogen sulfide ion Subsequently, question is, what does conjugate acid mean? The Lewis structure of H2S is similar to H. S. Sulfur needs eight electrons to fulfill the requirements for Octet Rule. hybrid orbitals and two lone pairs of electrons that make it an sp3 hybridization. [99], "Sulfane" redirects here. This gas is also produced by heating sulfur with solid organic compounds and by reducing sulfurated organic compounds with hydrogen. Formula and structure: The hydrogen sulfide chemical formula is H 2 S. The molar mass is 34.08 g/mol. This page was last edited on 2 September 2021, at 23:47. Many personal safety gas detectors, such as those used by utility, sewage and petrochemical workers, are set to alarm at as low as 5 to 10 ppm and to go into high alarm at 15 ppm. Oxygen demand was also reduced, thereby protecting against hypoxia. The formula indicates that an ion of hydrogen sulfate contains one atom of hydrogen, one atom of sulfur and four atoms of oxygen. State Representative E L Short took the lead in endorsing an investigation by the Texas Railroad Commission and urged that residents be warned "by knocking on doors if necessary" of the imminent danger stemming from the gas. It will also provide for the needs of students taking the Part 1 examination for Graduate Membership of the Royal Institute of Chemistry, or the Higher National Certificate, whilst the treatment is such that Ordinary National Certificate ... In total there are two pairs of non-bonding electrons in this compound and Hydrogen atoms have a complete valence shell. Found inside – Page 47... Chemical tube formula sulfide ion saChlorideion co tronion re” Copper ion cuCyanide ion ... 10 arxine, carbon monoxide 6-months trood), hydrogensulfide, ... There is no other way to figure out the name. CII: Pharmacological Modulation of H 2 S Levels: H 2 S Donors and H 2 S Biosynthesis Inhibitors", "Evolution of Hydrogen Sulfide Therapeutics to Treat Cardiovascular Disease", "Signalling by hydrogen sulfide and polysulfides via protein S ‐sulfuration", "A Stinky Compound May Protect Against Cell Damage, Study Finds", "Toxicological Profile For Hydrogen Sulfide", "Hydrogen Sulfide in Household Drinking Water", "Hydrogen Sulfide (Rotten Egg Odor) in Pennsylvania Groundwater Wells", "Hydrogen Sulfide in Drinking Water Treatment Causes and Alternatives", "Why Does My Water Smell Like Rotten Eggs? [20] It is becoming increasingly clear that H2S is an important mediator of a wide range of cell functions in health and in disease. [19] These enzymes have been identified in a breadth of biological cells and tissues, and their activity has been observed to be induced by a number of disease states. Exposure to hydrogen sulfide may cause irritation to the eyes and respiratory system. 10–20 ppm is the borderline concentration for eye irritation. ACD/Labs Percepta Platform - PhysChem Module, US Environmental Protection Agency’s EPISuite™, Compounds with the same molecular formula, Search Google for structures with same skeleton, Colorless gas with a strong odor of rotten eggs. When cooled below a critical temperature this high-pressure phase exhibits superconductivity. [19] CBS and CSE are the main proponents of H2S biogenesis, which follows the trans-sulfuration pathway. [20][21] Dietary amino acids, such as methionine and cysteine serve as the primary substrates for the transulfuration pathways and in the production of hydrogen sulfide. Several organosulfur compounds are produced using hydrogen sulfide. Found insideThis is the highest critical temperature of all chemical elements. Actually, the pressure-temperature phase diagram of sulfur is one of the most complicated of all elements and still needs further investigation. Set your categories menu in Theme Settings -> Header -> Menu -> Mobile menu (categories). Upon combining with alkali metal bases, hydrogen sulfide converts to alkali hydrosulfides such as sodium hydrosulfide and sodium sulfide: These compounds are used in the paper making industry. : C 20 ppm 50 ppm [10-minute maximum peak]. Chemical Formula: H2S The steric number is defined as the region of electron density seen around the central atom. Hypochlorous acid. In the case of students, this laboratory preparations manual can be used to find additional experiments to illustrate concepts in synthesis and to augment existing laboratory texts. ?‍♀ How on earth can u write its hybdzn to be sp3? At some threshold level, believed to average around 300–350 ppm, the oxidative enzymes become overwhelmed. [18] H2S has been shown to interact with NO resulting in several different cellular effects, as well as the formation of a new signal called nitrosothiol. [77] A CSB investigation cited lax safety practices at the facility, such as an informal lockout-tagout procedure and a nonfunctioning hydrogen sulfide alert system. Hydrogen sulfide (H(2)S) is a signalling gasotransmitter. Some of the hydrogen sulfide will react with metal ions in the water to produce metal sulfides, which are not water-soluble. Hydrogen phosphate ion … (See Appendix 6.) Found insideGuide to Practical Use of Chemicals in Refineries and Pipelines delivers a well-rounded collection of content, references, and patents to show all the practical chemical choices available for refinery and pipeline usage, along with their ... Thus, there are a total of eight valence electrons in H, The representation is displayed using dots and lines that represent electrons. Shipped as a liquefied compressed ga [14], Hydrogen sulfide is most commonly obtained by its separation from sour gas, which is natural gas with a high content of H2S. Hydrogen Sulfide Hydrogen sulfide has the chemical formula of H2S. HSO 4– very small hydrogen sulfate ion. Sodium sulfide, another ionic compound, has the formula \(\ce{Na_2S}\). In such processes, the hydrogen sulfide is first converted to an ammonium salt, whereas the natural gas is unaffected. The purple sulfur bacteria and the green sulfur bacteria use hydrogen sulfide as an electron donor in photosynthesis, thereby producing elemental sulfur. Required fields are marked *. There are two atoms of Hydrogen and a single atom of Sulfur in the compound. hydrogen sulfide: (H) [ hi´dro-jen ] a chemical element, atomic number 1, atomic weight 1.00797. If you don't recognize the … Now that we have the required information about the molecule, it is easy to determine its polarity. The area above it was sufficiently enclosed for the gas to pool there, despite not being identified as a confined space by Norske Skog. Found inside – Page 211Hydrogen sulfide is a chemical compound with the formula H2S. ... is slightly soluble in water and acts as a weak acid, giving the hydrosulfide ion HS−. Identification::: Chemical name :hydrogen sulphide Supplier's details : Hydrogen Sulfide Product use :Synthetic/Analytical chemistry. Hey folks, this is me, Priyanka, writer at Geometry of Molecules where I want to make Chemistry easy to learn and quick to understand. [43] It binds with iron in the mitochondrial cytochrome enzymes, thus preventing cellular respiration. The lower explosive limit (LEL) for H2S is 4.6% concentration, and will spontaneously ignite at around 518F. As Hydrogen Sulfide burns, it produces Sulfur Dioxide (SO2) gas which is also a very hazardous gas. S. Average mass 34.081 Da. In 2011 it was reported that increased concentrations of H2S were observed in the Bakken formation crude, possibly due to oil field practices, and presented challenges such as "health and environmental risks, corrosion of wellbore, added expense with regard to materials handling and pipeline equipment, and additional refinement requirements". This is the premier, single-source reference on redox biochemistry, a rapidly emerging field. Hydrogen sulfate can also react with water (as a base) and form hydronium ions. Thus, there are a total of eight valence electrons in H2S. CopyCopied, CSID:391, http://www.chemspider.com/Chemical-Structure.391.html (accessed 19:03, Sep 4, 2021)

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