CHEM 126 Lecture Notes - Lecture 8: Sodium Hydroxide, Ph Indicator, Burette

• School: Simon Fraser University
• Department: Chemistry
• Course: CHEM 126
• Professor: Jenny Wong

Document Summary

A buffered solution is one that resists a change in ph when small amounts of strong acid or base are added. It is also a mixture of a weak acid and its conjugate base or a weak base and its conjugate acid. The conjugate acid/base is added in the form of salt: in exp. 8, you were going to be asked to prepare a "buffer a" solution and a "buffer. Buffer b solution would resist changes to ph better as it has a greater buffer capacity that contains more acetic acid and acetate ion. The buffer capacity depends on the amounts of the weak acid and its conjugate base that are in the buffer mixture. The buffering capacity increases as the concentration increases: the procedure in exp. 8 asks you to add titrant in smaller amounts as you get closer to the equivalence point.