20. Distilled water, ammonia buffer solution and 20.0 ml of 0.01085M EDTA solution were added to 10.0 ml of NiCl2 solution. The excess of EDTA was titrated with 0.01292 M MgCl2, 5.47 ml were used for titration. Calculate the initial concentration (g/l) of the NiCl2 solution. Answer: 1.897 g/l.

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