HAc(aq) + H20(f) Ac-(aq) + H30\"(aq) pK, = 4.76. The acetate ion (denoted Ac) co

Question

HAc(aq) + H20(f) Ac-(aq) + H30"(aq) pK, = 4.76. The acetate ion (denoted Ac) complexes with Ni2+according to 2+ K1 = 26.9 You have a 0.200 M solution of acetic acid at pH = 4.76 (note: this sets [H3O+] and several other concentrations to constant values) combined with 0.150 M Ni(NO3)2 (a) (3 points) Write the charge balance for the system. (b) (3 points) Write the mass balance for iron species. (c) (6 points) Solve for the concentration of all species (5 in total). Hint: What does the pH tell you about the relative acid/base species?

Explanation / Answer

(a) Charge balance for the system:

HAc(aq) + H2O(l) = Ac-(aq) + H3O+(aq), H2O = H+ + OH-

Charge Balance : [H+] = [Ac-] + [OH-]

(b) For iron, the reaction will be........Fe2+(aq) + Ac-(aq) = Fe(Ac)+ , And H2O = H+ + OH-

Charge balance : [Fe2+] + [Fe(Ac)+] + [H+] = [Ac-] + [OH-]

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