![]() ![]() You can use ammonia solution instead of sodium hydroxide solution, but there are different results for aluminium and copper(II) salts when you use excess ammonia. Solutions containing copper(II) ions form a blue precipitate when mixed with sodium hydroxide solution. Solutions containing copper(II) ions form a blue precipitate when mixed with sodium hydroxide solution Check the balance Lead (II) hydroxide react with hydrogen peroxide to produce lead (IV) oxide and water. To the precipitate from step 2, add 15 to 20 drops of 6 M NH 3 and stir thoroughly. Separation and Identification of Hg 2 2 . add dilute sodium hydroxide solution until it is in excess and record the result. If Pb2 is present in the solution, a yellow precipitate of PbCrO 4 will form.record the colour of any precipitate that’s formed. ![]() Step 3 : To the precipitate an excess of the alkali is then added : This is done.
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