Question

Calculate the ph of a 0.1 m k3po4.The third dissociation constant of phosphoric acid os 10^-2

Answer 1

To Calculate the pH of a 0.1 m K₃PO₄ given that the third dissociation constant of phosphoric acid is 10^-2 you need to determine the degree of dissociation first.

Dissociation constant, ka= C∝² where C is the concentration and ∝ is the degree of dissociation

                                      10^-2=0.1∝²

                                           ∝=1

therefore equilibrium concentration is 0.1 x 1=0.1

                                    pH=-log0.1

                                        = 1.0