Why does the addition of ammonia to Cu(NO3)2 solution cause a precipitate to form?
Answer:
The ammonia first reacts with water to form ammonium hydroxide:
NH3(g) + H2O(l) --> NH4OH(aq)
then the ammonium hydroxide reacts with the Cu(NO3)2 to form Cu(OH)2(s):
2NH4OH(aq) + Cu(NO3)2(aq) --> Cu(OH)2(s) + 2NH4NO3(aq)
Ammonia which is NH3 causes the copper to corrode
Ammonia initially gives a precipitate of Copper hydroxide (sky blue solid) which will dissolve when more ammonia is added forming tetraamine copper complex (deep blue solution)
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