Phosphoric acid (H3PO4) can give up three protons, each with different pKa values consisting of 2.12, 7.21, and 12.67. If plotting pH as a function of sodium hydroxide solution added, which titration curve will be formed?

Kindly check the attached picture for the diagram showing the titration curve.

Explanation:

The term "titration" is an important part of chemistry because it is being used in the Determination of the concentration is the unknown.

In this question, the titration is done between a polyprotic weak acid, that is Phosphoric acid (H3PO4) and a strong base, NaOH.

H3PO4 + OH^- -----------------> H2O + H2PO4^-.

H2PO4^-2 + OH^- ---------------> H2O + HPO4^2-

HPO4^- + OH^- ------------------> H2O + PO4^3-.

23.5

23.5

47.0