85. Solving a chemistry problem
3. Calculate the concentration of magnesium (%, g/l, mg-eq/l) in water if, during titration of 100 ml of water with a solution of complex III (Na-EDTA) at pH 9.7 with a black crystal T until a blue color was obtained, 19.2 ml of a 0.1012 N solution of complexone III were obtained.
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