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In a 20 ml of solution zinc chloride concentration of 0,02 mol/dm3 a 15 ml solution of nickel(II) chloride of unknown concentration is added and the solution is diluted in a normal dish of 100 ml volume.For analysis 25 ml of that solution is taken.Then in that 25 ml solution 30 ml of EDTA solution of concetration of 0,0225 mol/dm3 is added. The formed solution is then titrated with standardized solution of magnesium sulfate of concentracion of 0,0505 mol/dm3 with the indicator eriochrome black T which requires a consumption of 5,10 ml of solution magnesium sulfate. Calculate the concentration of nickel (II) chloride.
Ka(ZnY2-)=3*10(16) alfay=0.052( pH=9) alfam=8*10(-6) (pH=9)