If necessary, protect non-glass surfaces of an overhead projector with clear plastic. Dip one Q-tip into concentrated hydrochloric acid (HCl) and a second cotton swab into concentrated aqueous ammonia ...

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Hydrochloric acid, HCl(aq), contains chloride ions. These would react with silver ions in the test, giving a false positive result. Key fact It may help to remember the silver halide precipitate ...

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