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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The reactions can then be reversed with the addition of hydrochloric acid. The precipitate will reappear and then redissolve. Turn on stir plate and add NaOH solution until Al(OH)3 precipitates. Add ...