First slide

Soaps

Question

Statement-I : Colloidal soap formed during saponification is precipitated by adding NaCl.
Statement-II : Sodium soaps are less softer than potassium soaps.

Moderate

A

Both statements I and II are correct.
B

Statement I is correct but statement II is incorrect
C

Statement I is incorrect but statement II is correct
D

Both statements I and II are incorrect.

Solution

I) The soap formed in colloidal form is precipitated by adding NaCl. [Na⁺] increases and thus the ionic product (Q_sp) of sodium stearate exceeds K_sp leading to precipitation of soap (sodium stearate). The left over solution containing glycerol is called spent lye. Glycerol decomposes much below its boiling point. So it is recovered from spent lye by using vacuum distillation.
II) Potassium soaps are softer than sodium soaps. Potassium soaps are used for babies.

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