What happens when: Hydrogen sulphide is bubbled through an aqueous solution of sulphide dioxide.
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Solution
Sulphur is precipitated . 2H2S+SO2+→3S+2H2O
hydrogen sulfide reacts with the solute H2SO4 in sulfuric acid. Both sulfur and sulfur dioxide are produced when the molar ratio of H2SO4/H2S is between 1.00 and 2.98, while all sulfur oxidizes to sulfur dioxide if H2SO4/H2S exceed 2.98.