Why on dilution the `Lambda_(m)` of `CH_(3)COOH` increases drastically, while that of `CH_(3)COONa` increases gradually?

Explanation

In the case of `CH_3COOH` which is a weak electrolyte, the number of ions increase on dilution due to an increase in degree of dissociation.
`CH_3 COOH + H_2 O hArr CH_3 COO + H_3 O^(+)`
In the case of strong electrolyte such as `CH_(3)COONa` the number of ions remains the same but the interionic attraction decreases.