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Industrial Preparation: Contact process

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Question

what happens when sulphur is dioxide gas passed through acidified potassium dicromate?

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Solution

When SO₂ is bubbled through K₂Cr₂O₇, the orange solution turns green.

This is a redox reaction, and occurs as follows:

3SO₂(g) + K₂Cr₂O₇(aq) + H₂SO₄(aq) --------> K₂SO₄(aq) + Cr₂(SO₄)₃(aq) + H₂O (l)

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