Why is nitric acid is added to Sodium extract before adding Silver nitrate for testing halogens?
Why is nitric acid is added to Sodium extract before adding Silver nitrate for testing halogens?
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Nitric acid is added to decompose NaCN and Na2S
NaCN + HNO3 → NaNO3 + HCN
Na2S + 2HNO3 → 2NaNO3 + H2S
H2S and HCN are gases and are escaped from the reaction vessel and do not interfere with the test.
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