Question

1)Which of the following will be more soluble in an acidic solution than in pure water? PbSO4, Cd(OH)2,AlPO4, CsClO4, AgCl

2)Which of the following will be more soluble in an acidic solution than in pure water? PbS, AgCl, CsClO4, Zn(OH)2, CaCO3

3)A 0.140-mole quantity of NiCl2 is added to a liter of 1.20 M NH3 solution. What is the concentration of Ni2 ions at equilibrium? Assume the formation constant* of Ni(NH3)62 is 5.5 × 108.

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Answer 1

There are six strong acids, HClO₄, H₂SO₄, HNO₃, HI,HBr and HCl. They completely dissociate in water to ClO₄^-, HSO₃^-, HNO₃^-, l^-, Br^- and Cl^- ions. Therefore, these six anions will not accept protons and their salts will not be more soluble in acid solution.

Hence,

1) Cd(OH)₂ ---------> Cd⁺² + 2OH^-

OH^- will accept protons in acid solution. Hence,Cd(OH)₂ is more soluble in acid solution.

2)

Zn(OH)₂ ---------> Zn⁺² + 2OH^-

OH^- will accept protons in acid solution. Hence, Zn(OH)₂ is more soluble in acid solution.