Question

Which chemical is added to soap to make it hard and compact?

Answer 1

The chemical which is added to soap after saponification to make it hard and compact is Sodium Chloride (NaCl).

Answer 2

Which chemical is added to soap to make it hard and compact?

The chemical is added to soap to make it hard and compact is called sodium chloride.

This chemical added during the process of preparation of soap to make it hard, compact and rigid.