Question: 8. A diprotic acid has two Ka values: H2L* H H + HL Kal HL > H+ + Kaz Assume that a solution of HL

8. A diprotic acid has two Ka values: H2L* H H

8. A diprotic acid has two Ka values: H2L* H H + HL Kal HL > H+ + Kaz Assume that a solution of HL is prepared, (a) write a charge balance for this system. (2 marks) (b) express [H*] in terms of Kai, Ka2, Kw, and [HL). (4 marks) (c) state the assumptions and show that the equation in (b) can be simplified as pH = 1/2 (PK: +pK2). (4 marks)

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