88. Solving a chemistry problem

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3. Weigh 0.1938 g of the drug and precipitate sodium magnesium hydrogen phosphate in an ammonium buffer medium. The precipitate was separated and dissolved in 50 ml of 0.09981 M hydrochloric acid; 18.0 ml of NaOH solution were used to titrate the excess acid (tNaOH=0.004 g/ml). Determine the mass fraction of magnesium in the drug.
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