Question

4. Due to common ion effect weak electrolyte becomes
A) More weak
B) More strong
C) Remain as it is
D) Either weak or strong
​

Answer 1

Answer:

more stronger than the earlier

Answer 2

Due to the common ion effect, weak electrolyte will become (A)more weak.

Step-by-step explanation:

What happens to a weak electrolyte due to presence of common ion?

Let us take the example of a mixture of acetic acid  $(CH_{3} COOH)$  and $HCl$.

$CH_{3} COOH$ is a weak acid while $HCl$ is a strong electrolyte.

The dissociation reactions are as follows:

$CH_{3} COOH$ ⇄  $CH_{3} COO^{-} +H^{+}$   -(i)

$HCl$   →   $Cl^{-}+H^{+}$                    -(ii)

• Reaction(i) is reversible because the acid is weak.
• Reaction(ii) is irreversible because the acid is a strong electrolyte.

Due to common ion $H^{+}$ , the equilibrium concentration of $H^{+}$ in reaction(i)

increases.

From Le- Chatelier's principle, the equilibrium will shift towards the left.

As a result the dissociation of $CH_{3} COOH$  decreases and the acid  becomes more weak.

Hence, due to the common ion effect, weak electrolyte becomes more weak.