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Questions
What happens when ammonia solution is added first dropwise and then in excess to the following solution:
ZnSO4
Write a balanced equation for this reaction.
Give the reactions to explain what happens when ammonia solution is added drop by drop till it is in excess to the following solution:
ZnSO4
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Solution
Adding ammonium hydroxide drop by drop to zinc sulphate solution forms a white gelatinous precipitate of zinc hydroxide.
\[\ce{\underset{\text{Colourless}}{ZnSO4} + 2NH4OH ->\underset{\text{White, gelatinous ppt.}}{Zn(OH)2\downarrow} + \underset{\text{colourless}}{(NH4)2SO4}}\]
Adding excess ammonium hydroxide dissolves the precipitate to form a clear, colourless complex solution.
\[\ce{\underset{Excess}{Zn(OH)2} + 4NH4OH -> \underset{(Colourless solution)}{\underset{Tetra-ammine zinc (II) hydroxide}{[Zn(NH3)4](OH)2}} + 4H2O}\]
Notes
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Rita was given an unknown salt for identification. She prepared a solution of the salt and divided it into two parts.
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