What do you observe when dilute sulphuric acid is added to sodium sulphate?
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Explanation:
The reaction between dil. sulphuric acid and sodium sulphite occurs in two steps and is a double replacement reaction.
In the first step, sulphuric acid reacts with sodium sulphite to give sodium sulphate and sulphurous acid.
H2SO4+Na2SO3→Na2SO4+H2SO3
In the second step, sulphurous acid, which is highly unstable decomposes spontaneously into sulphur dioxide and water.
H2SO3→SO2+H2O
Thus, the overall reaction is written as:
H2SO4 +Na2SO3→Na2SO4+SO2+H2O
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