The task of analytical chemistry 61

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Calculate the pZn in a solution obtained by mixing 40,0; 50,0 and 60,0 ml 0,00100 M EDTA with 50.0 ml 0,00100 M Zn2+. We believe that the Zn2+ and EDTA contain 0,100 M NH3 and 0,176 M NH4Cl, and this creates a constant pH of 9.0. The stability constants of ammonia complexes 2п2+ as follows: K1 = 1,9*10^2 K1K2 = 4,4*10^4, K1K2K3 = 1,04*10^7 and K1K2K3K4 = 1,14*10^9

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