Will color in a sample interfere with a titration?

Document ID

Document ID TE882

Version

Version 2.0

Status

Status Published

Published Date

Published Date 27/05/2017
Question
Will color in a sample interfere with a titration?
Summary
Color interference in a titration
Answer
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.