A green precipitate forms when dilute sodium hydroxide solution is added to a sample in solution. Identify the metal ion present in the original solution.

Add 3M or 6M NH4OH drop wise while stirring with the stir rod to one beaker or test tube of each pair. The solutions will become cloudy and change color due to the precipitation of metal hydroxides.

The precipitate will reappear and then redissolve. Turn on stir plate and add NaOH solution until Al(OH)3 precipitates. Add more NaOH until the hydroxide precipitate dissolves. Add HCl until the ...