For a pH 10 buffer containing ammonia (pKb=4.756) and ammonium at total concentration of 1.0 M, calculate the fraction of Zn2+ in the un-complexed form ([Zn2+]).
Assume that the Zn concentration is 0.00100 M calculate the pZn2+ at 2, 4, 5, 8, 9.9, 10, 10.5 mL when 100 mL of this zinc solution is titrated with a standardized 0.0100M EDTA solution. (2, 5, 8, 9.9, 10, 10.5 mL). Hint: There is a large difference in the total ammonia concentration and the Zinc concentration so make a sensible approximation
Zn2++NH3ZnNH32+ , βn1=102.21
Zn2++2NH3Zn(NH3)22+ , βn2=104.50
Zn2++3NH3Zn(NH3)32+ , βn3=106,86
Zn2++4NH3Zn(NH3)42+ , βn4=108.88
Zn2++H2OZnOH+ , βh1=108.997
Zn2++2H2OZn(OH)2 , βh2=1016.894
Zn2++3H2OZn(OH)3 , βh3=1028.391
Zn2++4H2OZn(OH)42 , βh4=1041.118
