Answer to Question #131746 in Chemistry for Shafqat Abbas

Question

While performing an experiment of finding out the saponification value of fat, he notes the volume of KOH consumed by BLANK is lower than that of test. What could be possible reason of this observation?

Answer 1

Saponification value or number of fat = mg of KOH consumed by 1g of fat.

Blank sample initially does not contain fat. KOH is consumed there to neutralize acidity.

Test sample hypothetically contains fat. Once the amount of KOH consumed for the test sample is higher than that for a blank sample, test sample contains some amount of fat. And it can be measured by comaring the difference of consumed KOH for blank sample and test sample.