Question

1. Recall the difference between the endpoint and the equivalence point in a titration. How does this difference affect choosing an indicator for a titration?

Answer 1

Titration is used in analytical chemistry to determine acid, bases, reductants, oxidants and other species. Titrations can usually occur in reactions such as redox reactions and acid-base reactions.

During the process, two important stages known as endpoint and equivalence point are reached. A point of equivalence in a titration refers to a point at which the added titrant is chemically equivalent to the sample analyte. In the other side, Endpoint is a point where the symbol changes color.

The main difference between equivalence and endpoint is that the equivalence point is a point where the chemical reaction comes to an end while the endpoint is the point where the colour change occurs in a system.

We need to choose an indicator which will change colour at the equivalence point.When selecting an indicator for acid-base titrations, choose an indicator whose pH range falls within the pH change of the reaction.