Question

write a short note on Buffer solution and solubility product

Answer 1

Answer:

Buffer solution:

• These are the solution which  opposes the change in its pH when acid or alkali is added.
• The solution which contains mixture of weak base and its conjugate acid or weak acid and its conjugate base.
• There is an equilibrium between weak base and its conjugate acid or vice versa.

•   $BOH\rightleftharpoons B^++OH^-$

• There are two types of buffer:

1. Acidic buffer: where pH is less than 7.
2. Basic buffer :where pH is greater than 7

Solubility product

It is a product of solubilites of ions present in mol per litre of the solvent.it is generally used  for sparingly soluble salts. It is denoted by the symbol$K_{sp}$.

The solubility product can be calculated as

$A_2B\rightleftharpoons 2A^++B^-$

                 2S    S

Where equilibrium concentration of both the ions in the solution be S.

$K_{sp}=K_c\times [A_2B]=[A^+]^2[B^-]^1=[2S]^2[S]=4S^3$