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. When burning sulphur is taken into the cylinder of oxygen, it burns with a brilliant blueflame. Name the gas produced. What happens when this gas reacts with water. Support youranswer with the equation. |
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Answer» Answer: Sulfur is only mildly flammable under normal ATMOSPHERIC conditions, but in pure oxygen, it burns with a very nice blue flame. The products of the combustion are sulfur dioxide and sulfur trioxide: S(s) + O2(g) ——> SO2(g) 2S(s) + 3O2(g) ——> 2SO3(g) These substances react with water in the air to produce SULFUROUS and sulfuric acid, respectively: SO2(g) + H2O(g) ——> H2SO3(g) [sulfurous acid] SO3(g) + H2O(g) ——> H2SO4(g) [sulfuric acid] This can be demonstrated by quenching the burning sulfur with a small amount of distilled water, and ADDING an APPROPRIATE acid-base indicator, such as methyl orange.
In the following demonstration, a small amount of sulfur is placed in a deflagrating spoon, heated in a Bunsen burner until it begins to burn, and then lowered into a jar of pure oxygen. The sulfur then flares up into a much brighter blue flame, and eventually begins to throw off fumes of sulfur dioxide and trioxide.
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