Why is nitric acid is added to Sodium extract before adding Silver nit – InterviewSolution

InterviewSolution

1.

Why is nitric acid is added to Sodium extract before adding Silver nitrate for testing halogens?

Answer»

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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