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sodium sulfite is soluble in water...though it may partially reacts to liberate SO2 gas and it can make the water acidic too

Na2SO3 + H2O → 2NaOH + SO2 (only partial)

But in acidic medium it decomposes as

Na2SO3 + 2 H+ → 2 Na+ + H2O + SO2

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13y ago

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