Question

1. Name three carboxylic acids whose sodium salts you might expect to find after saponification of Spry or Crisco.

2. Why is the pH of soap made from crisco around 8-10?

3. Write a chemical equation to show the formation of a solid from soap and HCl

Answer 1

1. Saponification of crisco or spry produces Palmitic acid, myristic acid and linoleic acid.

2. the pH of soap made from crisco is at around 8-10, as it forms salt of carboxyllic acid which when hydrolyzed in water gives off OH- ions which makes the system basic and pH thus is around 8-10.

3. Formation of solid from soap and HCl

Addition of HCl to soap neutralizes the carboxylate and gives us solid carboxylic acid,

RCOONa (soap) + HCl ---> RCOOH (solid) + NaCl

So, with RCOONa be the formula of soap, it reacts with HCl to form RCOOH which is carboxylic acid of salt RCOONa and is a solid.