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Sodium hydrogen sulphite, NaHSO3

The primary sulphite can be isolated by precipitating with alcohol a solution of sodium carbonate saturated with sulphur dioxide:

Na2CO3+2SO2+H2O = 2NaHSO3+CO2.

Besides the anhydrous salt, there is a trihydrate, and also a tetrahydrate. Barth has investigated the electric conductivity.

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