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What factors will affect the determination of iodine value of castor oil?

In this experiment, acid value and saponification value are neutralized, and iodometry is used for iodine value. The acid value is determined by dissolving the sample in a mixed solution of ethanol and ether and neutralizing the free fatty acid with potassium hydroxide (sodium hydroxide). The saponification value is determined by hydrolyzing the sample with ethanol solution of alkali, neutralizing the decomposed fatty acids with alkali, and titrating the remaining alkali with standard hydrochloric acid. The iodine value is determined by dissolving the sample with chloroform, an inert solvent, and adding excessive iodine bromide standard solution, thereby adding halogen.