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CuSO4 on mixing with NH3 (1:4) does not give test for Cu2+ ions but gives test for SO42- ions. Why? |
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Answer» It is because when NH3 coordinates to Cu2 ions it forms the complex [Cu(NH3)4]SO4. Copper ions are present in coordination sphere, therefore, they are non- ionisable whereas SO4 2- ions are counter ions which are ionisable. |
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