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136. Solving a chemistry problem

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The weight of magnesium chloride is 0.2842 g, dissolved in a volumetric flask with a capacity of 250 cm3. For titration of 10.00 cm3 of this solution, 5.00 cm3 of a 0.0200 M complexone III solution was used. Calculate the mass fraction in percent of MgCI2 in the studied salt sample.
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