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Why is nitric...

Question

Why is nitric acid added to sodium extract before adding silver nitrate for testing halogens?

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Solution

The added nitric acid decomposes NaCN to HCN and $N a_{2} S$ to $H_{2} S$ .
$N a C N + H N O_{3} \to N a N O_{3} + H C N$
$N a_{2} S + 2 H N O_{3} \to 2 H N O_{3} + H_{2} S$
This removes all the nitrogen and sulphur present. Hence, only halogen is available for testing.

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