Page 83 - Statistics presented by Dr. Sara Ismail Aborass
P. 83
9/8/2023
Saponification value
Number of mg of KOH required to neutralize the free acids and to saponify
the esters in 1 g of the substance. (Neutralization and Saponification)
SPV = FFA + combined FA
Acid value
Determination
Certain weight of substance examined, reflux with known volume of
ethanolic KOH for ~ 1h, titrate excess KOH ≠ st. HCl, ph.ph ind (back tit)
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Significance
It is a measure of FA chain length/ Mw
SPV is inversely proportional to mean Mw of FA, i.e. low Mw FAs require
high amount of KOH for their saponification
To detect presence of glycerides of low Mw FAs, e.g. butter fat, SPV ~ 250
To detect adulteration with paraffin oil "Unsaponifiable oil"→ very low SPV
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