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Question
How will you distinguish between Ammonium hydroxide and Sodium hydroxide using copper sulphate solution?
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Solution
Ammonium hydroxide when added to copper sulphate drop-wise forms a pale blue ppt. of copper hydroxide which dissolves in excess of ammonium hydroxide to form a deep blue solution of tetrammine copper sulphate.
CuSO4 + 2NH4OH 
Cu OH2 + NH4 2SO4
pale blue ppt colourless in solution
With excess of NH OH ppt. dissolves
Cu OH2 + NH4 2SO4 + 2NH4OH |Cu NH3 4|SO4 + 4H2O
Tetrammine
Copper II sulphate
Sodium hydroxide when added to copper sulphate drop-wise forms a pale blue ppt. of copper hydroxide which is insoluble in excess of sodium hydroxide solution.
CuSO4 + 2NaOH Cu OH2 + Na2SO4
pale blue ppt colourless
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RELATED QUESTIONS
State your observations when ammonium hydroxide solution is added drop by drop and then in excess to the following solution:
Copper sulphate solution
You are provided with PbCO3, ZnCO3 and CaCO3. How will you identify these cations?
Fill in the blank.
The salt which will not react with NH4OH solution ______[ZnCl2, CuCl2 / NH4Cl/ FeCl2]
State two relevant observations of the following:
Ammonium hydroxide solution is added to zinc nitrate solution in minimum quantities and then in excess.
How would you distinguish between Zn2+ and Pb2+ using ammonium hydroxide solution?
What would you observe in the following case:
Ammonium hydroxide is first added in a small quantity and then in excess to a solution of copper sulphate.
Write balanced equation:
Copper sulphate solution with ammonium hydroxide solution.
Rita was given an unknown salt for identification. She prepared a solution of the salt and divided it into two parts.
- To the first part of the salt solution, she added a few drops of ammonium hydroxide and obtained a reddish-brown precipitate.
- To the second part of the salt solution, she added a few drops of silver nitrate solution and obtained a white precipitate.
Name:
- The cation present and
- The anion present in the salt given for identification.
Write balanced equation:
Copper sulphate solution with ammoni um hydroxide solution.
Write balanced equation:
Copper sulphate solution with ammonium hydroxide solution.
