Haley B.

asked • 06/21/18

Why is the pH of the first equivalence point, of a titration of polyprotic acid, not equal to7?

A titration of phosphoric acid with sodium hydroxide. The first equivalence point has a pH of about 5. 
 
My thoughts are that because it is only the first equivalence point, only one H+ has been pulled away from the polyprotic acid, therefore the acid hasn't been fully neutralized leaving the solution more acidic.
Am I on the right track or am I missing something?

1 Expert Answer

By:

Tesfaye D. answered • 06/21/18

Tutor
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