Question

A soultion is prepared by mixing Mt moles of the salt MCl2 (which dissociates completely to M^2+ +2Cl-) and Lt moles of the ligand HL in 1 L. The following reactions may occur:

M^2+ + L- <------>ML+ K=1.0x10^8 HL(aq) <------> L- + H+ Ka= 1.0x10^-5

a) Write a mass balance for the metal species.

b) Write a mass balance for the ligand species. c) write a charge balance

d) Suppose that Mt=Lt=0.1 M (exactly) and the pH is somehow fixed at 5.00. ( This means that the charge balance no longer applies.) Use the equilibria and the two mass balances to find the concentrations of ML+, M^2+, L-, and HL.