Question

why soap soft then detergent

Answer 1

Because the hydrogen tails make it soft

Answer 2

Explanation:

$<p style ="Color:cyan; font-family: cursive; background:black;font size25px;"> A number of fats and oils are heated and mixed with a liquid alkali to produce soap and water (neat soap) plus glycerine. Fats and oils are hydrolyzed with a high-pressure steam to get crude fatty acids and glycerine. The fatty acids are purified by distillation and neutralized with an alkali to produce soap.$