Tue September 24, 2013 By: Sakshi Singh

A white turbidity is obtained by passing H2S in aq. soln of SO2. Why?

Expert Reply
Vaibhav Chavan
Wed September 25, 2013
Sulphur dioxide dissolves in water to form sulphurous acid.
SO2 + H2O ? H2SO3
Aqueous solution of SO2 and H2S undergoes redox changes to produce colloidal sulphur as white turbidity.
2H2S + H2SO3 ?3H2O + 3S(Colloidal sulphur)
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