Page 176 - Pharmaceutical Analytical Chemistry III
P. 176
Chemical examinations
Acid value
Number of mg of KOH required to neutralize the free
fatty acid "FFA" in 1 g of the substance
DRetCerOmOinaHtion+ KOH → RCOOK + H2O
Dissolve a certain wt of the substance examined in ethanol/ether 1:1,
titrate ≠ KOH, ph.ph ind
Significance
It is a measure of degree of hydrolysis of oil/fat → FFA
It is a test of freshness or edibility of the sample
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