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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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RELATED QUESTIONS
Choose the correct answer from the options given below:
A chloride which forms a precipitate that is soluble in excess of ammonium hydroxide is:
1) Calcium chloride
2) Ferrous chloride
3) Ferric chloride
4) Copper chloride
State your observations when ammonium hydroxide solution is added drop by drop and then in excess to the following solution:
Copper sulphate solution
Name the method used for preparation of the following salt from the list given below:
Zinc ion and Lead ion.
Fill in the blank.
The salt which will not react with NH4OH solution ______[ZnCl2, CuCl2 / NH4Cl/ FeCl2]
State what do you observe when:
Ammonium hydroxide is added to iron (III) sulphate solution.
Choose the correct answer from the options given below :
A chloride which forms a precipitate that is soluble in excess of ammonium hydroxide is :
Identify the cation of the following case:
NaOH solution when added to solution (A) gives a reddish brown precipitate
Identify the cation of the following case:
NH4OH solution when added to solution (B) gives white ppt. which does not dissolve in excess.
Write balanced equation copper sulphate solution with ammonium hydroxide solution.
Write balanced equation:
Copper sulphate solution with ammoni um hydroxide solution.
