Litmus test to distinguish between sulphur dioxide and hydrogen sulphide
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Explanation:
The reaction with lead salts is the basis for the traditional test for hydrogen sulphide gas. Moist lead acetate (lead ethanoate) paper (see image, right) turns from white to silvery grey or black when exposed to H2S.
Sulphur dioxide converts the moist dichromate from orange to green
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If sulfur dioxide gas is bubbled through acidified potassium dichromate solution, the orange solution turns green, indicating that Cr
2
O
7
2−
has been reduced to Cr
3+
.
Cr
2
O
7
2−
+2H
+
+3SO
2
→2Cr
3+
+H
2
O+3SO
4
2−
But CO
2
doesn't give this test as it cannot oxidise further, so it can not reduce dichromate solution.
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