Sulfur Daily Question 2018.8.26
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Question: Explain the combustion of hydrogen sulfide in air? Answer: Hydrogen sulfide burns in air with a pale blue flame, and different products are formed depending on the amount of oxygen supplied. In the presence of peroxide: H2S + 3/2 O2 === H2O + SO2 + Q. In the absence of oxygen: H2S + 1/2 O2 === H2O + S + Q. H2S possesses strong reducing properties; at room temperature, it can also undergo oxidation reactions in air. Therefore, H2S is a strong reducing agent: 2H2S + O2 ==== 2H2O + 2S + Q
When hydrogen sulfide burns, it produces a blue flame and toxic sulfur dioxide gas, which can damage human eyes and lungs. When there is an adequate supply of air, SO2 and H2O are produced.
Similar to the combustion of sulfur, it appears light blue in air and bright blue-violet in pure oxygen. This is mainly because hydrogen sulfide contains sulfur; it can be considered that oxygen first displaces sulfur, after which sulfur burns (this also explains why hydrogen sulfide does not burn completely when there is a lack of oxygen).
When there is sufficient air: 2H2S + 3O2 = 2SO2 + 2H2O. When there is insufficient air: 2H2S + O2 = 2S + 2H2O. The phenomenon is the same as that of sulfur burning; it appears light blue in air
Completely dry hydrogen sulfide does not react with oxygen in the air at room temperature, but it can burn in air when ignited, such as during drilling or blowouts in wells; its combustion efficiency is only around 86%. When hydrogen sulfide burns, it produces a blue flame and toxic sulfur dioxide gas
When hydrogen sulfide burns, it produces a blue flame and toxic sulfur dioxide gas, which can damage human eyes and lungs. When there is an adequate supply of air, SO2 and H2O are produced
Answer: Hydrogen sulfide burns in air with a pale blue flame, and different products are formed depending on the amount of oxygen supplied. In the presence of peroxide: H2S + 3/2 O2 = H2O + SO2 + Q. In the absence of oxygen: H2S + 1/2 O2 = H2O + S + Q
Completely dry hydrogen sulfide does not react with oxygen in the air at room temperature, but it can burn in air when ignited, such as during drilling or blowouts in wells; its combustion efficiency is only around 86%. When hydrogen sulfide burns, it produces a blue flame and toxic sulfur dioxide gas, which can damage human eyes and lungs. When there is an adequate supply of air, SO2 and H2O are produced. If there is insufficient air or the temperature is low, free S and H2O are formed. In addition to oxygen or air, hydrogen sulfide can also burn in chlorine and fluorine.
When hydrogen sulfide gas is ignited at the tip of a glass tube, its flame is blue. If a wet blue litmus paper is placed above the flame (without touching it), the blue paper will turn red, indicating that the gas produced upon the combustion of hydrogen sulfide is acidic. If a test tube is placed over a hydrogen sulfide flame (with its outer wall in contact with the flame), it will not be long before a layer of yellow solid appears on the outer wall of the test tube. 2H2S + 3O2 = 2SO2↑ + 2H2O. Sulfur dioxide dissolves in water to form sulfurous acid, which can turn blue litmus paper red. If there is not enough air (the second situation), it can only oxidize hydrogen sulfide to sulfur: 2H2S + O2 = S + 2H2O. The yellow solid that can be seen in the test tube placed over the hydrogen sulfide flame is sulfur.
Completely dry hydrogen sulfide does not react with oxygen in the air at room temperature, but it can burn in air when ignited, such as during drilling or blowouts in wells; its combustion efficiency is only around 86%. When hydrogen sulfide burns, it produces a blue flame and toxic sulfur dioxide gas, which can damage human eyes and lungs. When there is an adequate supply of air, SO2 and H2O are produced. If there is insufficient air or the temperature is low, free S and H2O are formed. In addition to oxygen or air, hydrogen sulfide can also burn in chlorine and fluorine.
When hydrogen sulfide burns, it produces a blue flame and toxic sulfur dioxide gas, which can damage human eyes and lungs. When there is an adequate supply of air, SO2 and H2O are produced.