(a) How much more soluble
is AgCl in 1 Molar NH3 than in water?
(b) How much more soluble is CaSO4 in 1 Molar HNO3 than in water?
(b) How much more soluble is CaSO4 in 1 Molar HNO3 than in water?
Sol:
1) A chloride solution of metal reacts with silver nitrate solution
to produce a precipitate. The precipitate is soluble in Ammonia solution:
Actually,
NH3 complexes silver to make Ag (NH3)2, and this reaction is favorable enough
to make AgCl dissolve (but not the much more insoluble Agcl. Hence Agcl is
soluble in 1 molar NH3 to some extent.
2Agcl +
4NH3 ==> 2Ag (NH3)2 + cl2
2) CaSO4 is infinitely much more soluble in 1 molar HNO3. The
reason is that the CaSO4 (mostly insoluble in water) is converted to Ca (NO3)2
which is very much soluble in water. As a result calcium sulphate is infinitely
very much soluble in nitric acid.
CaSO4 +2HNO3 ==> Ca(NO3)2 + H2SO4
CaSO4 +2HNO3 ==> Ca(NO3)2 + H2SO4
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