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An impure sample of (COOH)2 ·2 H2O that
has a mass of 3.4 g was dissolved in water
and titrated with standard NaOH solution.
The titration required 42.7 mL of 0.156 molar
NaOH solution. Calculate the percent
(COOH)2 · 2 H2O in the sample.
Answer in units of %.

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  1. (COOH)2.2H2O + 2NaOH ==> (COONa)2 + 4H2O

    mols NaOH = M x L = ?
    mols (COOH)2 = 2 x mols NaOH from the coefficients in the balanced equation.
    grams (COOH)2.2H2O = mols x molar mass. This is the theoretical yield (TY)
    %(COOH)2.2H2O in the sample is
    (TY/mass sample)*100 = ?

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