Will color in a sample interfere with a titration?
Color interference in a titration
Color interferes with most titration methods if a visual indicator (like phenolphthalein) is used to determine the endpoint. Background color can make the endpoint difficult to see. To eliminate the color interference the operator can try to dilute the sample. If performing a sample dilution does not eliminate the color interference, then the method is not compatible with the sample and the operator should select a different method. In a titration which uses acids and bases, the operator can use a pH probe to determine the endpoint as this typically occurs at a specific pH.