136. Solving a chemistry problem
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136. Solving a chemistry problem
Calculate the concentration of magnesium (mmol/dm3), which determines the hardness of water, if 18.45 cm3 of 0.0500 M solution of complexone III is used up to a blue color when titrating 100 cm3 of a sample at pH=9.7 in the presence of black T chromogen to a blue color.
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