69. Solving a chemistry problem
3. 50.00 cm3 of sulfuric acid with a molar concentration of 0.0500 mol/dm3 (K=0.9991) was added to 0.1560 g of commercial barium chloride containing impurities. The excess acid was titrated with 25.50 cm3 of sodium hydroxide solution with a molar concentration of 0.0450 mol/dm3. Calculate the mass fraction of BaCl2 in the sample.
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