To accurately determine the acidity (FFA content) of your oil, you need to accurately know the strength of your base solution. It is nearly impossible to measure out a small amount of the base (like sodium hydroxide) to mix into a solution with a high degree of accuracy. One of the problems encountered in trying to do this, is the fact that NaOH quickly absorbs water and CO2 out of the air. This makes the compound both heavier and weaker. Steps 2-6 (above) have allowed you to determine the strength of the basic solution that you are using to titrate your oil. To double check the strength of your base solution, repeat steps 2-6 to make sure the results compare.
SUMMARY OF TITRATION METHODOLOGIES
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