The first step in doing a titration is preparing a solution of a known molarity that can be used in the titration to determine the amount of acid.  This solution is made up of 1 gram of catalyst to 1000 grams of distilled water.  Whatever catalyst you plan to use while processing the oil is what you should use here, if you use two different catalyst then you will not have the right amount to neutralize the free fatty acids.  Start by measering 1000 ml or grams or distilled water, this measurement needs to be accurate because if it is not then you won't know the molarity of the solution.  Next measure 1 gram of NaOH or KOH, this measurement also needs to very accurate if you are off you will not get very good titration results.  After the 1 gram is measured add it to the 1000 grams of distilled water.  Mix this solution well for a few minute untill all the KOH or NaOH is dissolved in the water.  Once the catalyst is disolved then you should be ready to titrate your first ml of oil.

A titration is used to determine the amount of catalyst is required to react a large batch of oil by determining the amount of acid in a small sample.  The results are then plugged into a formula to determine how much catalyst will be required for a large batch.  It works by taking a acidic solution of unknown molarity and mixing with a basic solution of known molarity.  We know the volume of the solution with unknown molarity.  From that information we can determine the molarity of the unknown by finding how much of the known is required to nuetralize it.  However we are going to save you some time and you can just use the formula below.

Lets get started on this titration.  Start by measuring 10ml of isopropyl alcohol by whatever means you so desire.  Next, add 2-3 drops of phenol red. Phenol red is used as a ph indicator and will turn yellow when the liquid is an acid and purple when it is a base.  At this point you may find that your isopropyl alcohol is slightly acidic as it turns yellow, you may find it nessecary to add a couple drops of your stock solution to it untill it turns barely purple.  If you don't do this then it may skew your results as you wont only be titrating the oil but the combination of the oil and alcohol.  Once the alcohol is nuetral add 1 ml of the oil to titrated, the accuracy of this measurement is critical.  After the oil is added proceed by swirling and stiring so that the oil is dissolved in the alcohol.  Expect the result to be yellow and continue by adding the solution you made earlier, continue to swirl and mix as you add.  Be sure to keep track of how much solution you are adding.  Continue adding solution and stirring untill the oil and alcohol turn a brilliant purple and stay that way for 20 seconds.  Record the amount of solution you added and repeat the process.  You should repeat several times and then throw any outlyers out and average the results.  This practice ensures accuracy before you scale it up to a big batch.

Take the results you got and plug them into the following formulas to solve for the amount of catalyst you need in a large batch:

KOH:

 V * (3.5 + T) = M

V = Volume of oil in Liters

T = titration value

M = mass of catalyst required in grams 

NaOH:

V * (5 + T) = M

V = volume of oil in liters

T = titration results

M = Mass of catalyst required in grams