Find out total number of cation(s) that produce precipitate with aqueous solution of Na2CO3. Cu2+(aq.), Mg2+(aq.), Fe3+(aq.), Pb2+(aq.), Al3+(aq.), Hg2+(aq.), Zn2+(aq.), NH4+(aq.), Cs+(aq.)

Question

Prashant Kotian · Accepted Answer

Correct answer: **7** / ALL CARBONATES ARE WATER INSOLUBLE EXCEPT (NH4)2CO3 AND ALKALI METAL CARBONATES. THUS NH4+(AQ.) AND CS+(AQ.) SALTS ARE WATER SOLUBLE WHILE OTHERS ARE INSOLUBLE.. Step 1: Identify the reactants. Silver acetate, CH3COOAg↓, is a sparingly soluble precipitate, and HNO3 is a strong mineral acid. Step 2: Analyze the proton-transfer equilibrium. Nitric acid protonates the weakly basic acetate anion to form weakly dissociated acetic acid, shifting the solubility equilibrium to dissolve silver acetate into soluble silver ions (AgNO3). Step 3: Because the solid precipitate is dissolved by the acid, this is a precipitate dissolution reaction (type B). Thus, the correct option is (b).

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