Question

which of the following salt will produce more basic solution if added in water .? .a.Al (Cl)3 .b. FeCl3 .c. CH3COOH .d. Pb (CH3CCOO)2

Answer 1

Conjugate base concept:

When you remove an H⁺ from an acid, you get its conjugate base.

Everything here is related because, if the acid is strong, then its conjugate base will turn out to be weak;

and if the acid is weak, then its conjugate base will be strong.

eg: HCl is a strong acid, so its conjugate base Cl⁻ is a weak one.

Same thing in case of bases, but here you will have to remove OH⁻ to get the conjugate acid.

eg: Pb(OH)₂ is a relatively weak base, and hence Pb⁺² is a strong conjugate acid.

Coming to the question,

CH₃COOK is a salt which will produce a more basic solution when added in water.

It is because CH₃COO⁻ ion is the conjugate base of a weak acid(CH₃COOH), so it acts as a strong conjugate base.

Also, K⁺ is the conjugate acid of a strong base(KOH), thus it acts as a weak conjugate acid.

But, you might think why Pb(CH₃COO)₂ is not the answer;

well, it's because Pb⁺² is the conjugate acid of a weak base(Pb(OH)₂), so it acts as a strong conjugate acid.

but CH₃COO⁻ is strong conjugate base, so the final solution here is near neutral.

Hence your answer is CH₃COOK