Thursday, October 1, 2009

ACID VALUE OF OILS


AIM:
To determine the Acid value of given oil.
PRINCIPLE:
Acid value is the number of mg of KOH required to neutralise the FFA present in 1g of the sample
REAGENTS:
Neutral alcohol, 1% phenolphthalein,Standardised .1N NaOH
PROCEDURE:


  • Weigh accurately about 10 gm of oil into a 100ml conical flask.

  • Add 50 cc of neutral alcohol & heat on a steam bath till the oil dissolves.

  • Cool for a while,add 4 drops of phenolphthalein.

  • With constant shaking titrate the contents in the flask against 0.1N NaOH solution from the burette till a pink color persists.

  • FFA% & Acid value is calculated from the above procedure.


2 comments:

  1. what are the draw backs of decrease in iodine value & increase in acid values of edible palm oil & rice bran oil & soya refined oil

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  2. Deepak the side effects of increase in acid value is that the amount of free fatty acids in oil is increased and is certainly harmful to human body so higher the acid value less consumable is the oil...

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