when sulphur dioxide gas is passed through lime water it turns milky but the milkiness disappears when sulphur dioxide is passed for a longer time.Why?

Asked by mahimachaki chaki | 22nd Nov, 2013, 08:51: PM

Expert Answer:

SO2 turns lime water milky due to formation of calcium sulphite.

Ca(OH)2  +  SO2 → CaSO3   + H2O

Milkiness disappears due to formation of calcium hydrogen sulphite which is soluble in water.

CaSO3 + SO2 + H2O → Ca (HSO3)2

                                   Calcium hydrogen sulphite

Answered by Vaibhav Chavan | 25th Nov, 2013, 10:11: AM

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