Practice!

Sample Problem

Using the titration curve of phosphoric acid, find the equivalent point(s) and select the corresponding letter.

A

B

C

D

E

F

G

Solution

Phosphoric acid (H3PO4) is a polyprotic acid that produces 3 moles of hydrogen ion per mole of acid, and therefore has 3 equivalence points. They are the steepest points on the graph at B, D, and F.