Sodium extract is heated with concentrat...

Sodium extract is heated with concentrated `HNO_(3)` before testing for halogens because:

Silver halides are totally insoluble in nitric acid

`Ag_(2)S` and AgCN are soluble in acidic medium

`S^(2-)` and `CN^(-)`, if present , are decomposed by conc. `HNO_(3)` and hence do not interfere in the test

Ag reacts faster with halides in acidic medium

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A : Before testing of halogens, sodium extract must be boiled with concentrated HNO_(3) R: Concentrated HNO_(3) destroy CN ^(-) and S^(-) by oxidation.

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