Bepaling van het zuurgetal
The acid value IA is the number that expresses in milligrams the quantity of potassium hydroxide required to neutralise the free acids present in 1 g of the substance.
Dissolve 10.00 g of the substance to be examined, or the quantity prescribed (m g) in 50 ml of a mixture of equal volumes of alcohol R and ether R, previously neutralised with 0.1 M potassium hydroxide, unless otherwise specified, using 0.5 ml of phenolphthalein solution R1 as indicator. When the substance to be examined has dissolved, titrate with 0.1 M potassium hydroxide until the pink colour persists for at least 15 s (n ml of 0.1 M potassium hydroxide).
IA= 5.160 . n / m
10 september 1999