Question

The solubility product of a soluble salt `A_(x)B_(y)` is given by: `K_(SP)= [A^(y+)]^(x) [B^(x-)]^(y)`. As soon as the product of concentration of `A^(y+)` and `B^(x-)` increases than its `K_(SP)`, the salt start precipitation. It may practically be noticed that AgCI is more soluble in water and its solublity decreases dramatically in `0.1M NaCI` or `0.1M AgNO_(3)` solution. It may therefore be conncluded that in presence of a common ion, the solubiolity of salt decreases.
The salting out action of RCOONa in presence of NaCI is based on:
A. common ion effect
B. hydrolysis of salt
C. solubility product
D. complex formation

Answer 1

Correct Answer - C
`NaCIrarrNa^(+)+CI^(-)`,
`CH_(3)COONahArr CH_(3)COO^(-)+Na^(+)`
`K_(SP)= [CH_(3)COO^(-)][Na^(+)]`
In prersence of `Na^(+), [CH_(3)COO^(-)][Na^(+)]` exceeds `K_(SP)` to give precipitation of soap.