Elements of Groups 16, 17 and 18 — Chemistry STD 12 Science — Question
Maharashtra BoardEnglish MediumSTD 12 ScienceChemistryElements of Groups 16, 17 and 182 Marks
Question
What happens when an excess of $SO _2$ is passed through sodium hydroxide solution?
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Answer
When $SO _2$ gas is passed through sodium hydroxide solution $( NaOH )$, it forms sodium sulphite, $Na _2 SO _3$ which further with excess of $SO _2$ forms sodium hydrogen sulphite, $NaHSO _3$. $\begin{aligned} & 2 NaOH + SO _2 \rightarrow Na _2 SO _3+ H _2 O \\ & Na _2 SO _3+ H _2 O + SO _2 \rightarrow 2 NaHSO _3 \end{aligned}$
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