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State Your Observations When Ammonium Hydroxide Solution is Added Drop by Drop and Then in Excess to Each of the Following Solutions Copper Sulphate Solution and Zinc Sulfate Solution - Chemistry

Short Note

State your observations when ammonium hydroxide solution is added drop by drop and then in excess to each of the following solutions :
1) Copper sulphate solution

2) Zinc sulfate solution.

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When NH4OH is added to copper sulphate solution drop-wise, a pale blue ppt. is obtained.

CuSO4 + 2NH4OH Cu(OH)2 + (NH4)2SO4 + 4H2O

With the excess of NH4OH, the ppt. dissolves to give a deep blue solution of tetraamine copper(II)sulphate

Cu(OH)2 + (NH4)2SO4 + 2NH4OH  [Cu(NH3)4]SO4 + 4H2O

2) When NH4OH is added to zinc sulphate solution drop-wise, a white, gelatinous ppt. is obtained.

ZnSO4 + 2NH4OH  Zn(OH)2 + (NH4)2SO4

With the excess of NH4OH, the ppt. dissolves to give a colorless solution of tetraamine zinc(II)sulphate.

Zn(OH)2 + (NH4)2SO4 + 2NH4OH  [Zn(NH3)4]SO4 + 4H2O

Concept: On Solution of Salts - Special Action of Ammonium Hydroxide on Solutions of Copper Salt
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Frank ICSE Class 10 Chemistry Part 2
Chapter 4 Analytical Chemistry
Exercise | Q 3 | Page 91
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