Q$4$: A $3\mathrm{.}085$ gram of fat sample was saponified by KOH solution $($M$.$wt$.-56\frac{g}{m}ol).$ The amount of the used base was neutralized by $21mL$ of $0\mathrm{.}04MHCl.$ Calculate the saponification value of this sample. Titration of blank takes $1\mathrm{.}5mL$ of the same solution of $HCl.$

$(4$ marks$)$

Qs: Choose the correct answer:

$(6$ marks$)$

The acid value of an oil sample with time.

a$)$ Decreases

b$)$ Increases

c$)$ Remains constant

d$)$ may increase or decrease

Which of the following term describe saponification?

a$)$ Cleaving of ester molecules into carboxylic acid and alcohol

b$)$ Dehydration synthesis by removing water

c$)$ Hydrolysis of a salt by adding a weak acid

d$)$ Synthesis of two alkyl groups to make an ether

Which of the following statement is true about saponification value of oil?

a$)$ The shorter the chain of fatty acid, the higher is the saponification value

b$)$ The shorter the chain of fatty acid, the higher is the saponification value

c$)$ The higher the saturation in chain of fatty acid, the lower is the saponification value

d$)$ The lower the saturation in chain of fatty acid, the higher is the saponification value

Good Luck

$!!$