Fatty acids can be classified into two major groups depending on the nature of covalent bond:
|Fatty Acid Calculation|
V - Volume of sodium hydroxide
N - Normality of sodium hydroxide
F - Equivalent factor
Unsaturated fatty acids have one or more double bonds between carbon atoms. (Pairs of carbon atoms connected by double bonds can be saturated by adding hydrogen atoms to them, converting the double bonds to single bonds. Therefore, the double bonds are called unsaturated.)
Saturated fatty acids are long-chain carboxylic acids that usually have between 12 and 24 carbon atoms and have no double bonds. Thus, saturated fatty acids are saturated with hydrogen (since double bonds reduce the number of hydrogens on each carbon). Because saturated fatty acids have only single bonds, each carbon atom within the chain has 2 hydrogen atoms (except for the omega carbon at the end that has 3 hydrogens).
Calculate the estimated percentage of free fatty acid.
Volume of sodium Hydroxide = 25
Normality of sodium hydroxide = 10
Equivalent factor = 30
Weight of sample = 15
Percentage of free fatty acid = (V * N * F /weight of sample)