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Why must some anions be acidified with dilute nitric acid first before adding silver nitrate?

April 26, 2017acid acidified anions Chemistry dilute Mathematics nitric

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Why must some anions be acidified with dilute nitric acid first before adding silver nitrate?

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Some anions are acidifed with dilute nitric acid to remove interfering ions like sulfide ions and carbonate ions. If you don’t do this step, it’s easy to confuse silver sulfide or silver carbonate precipitates with that of silver halides.