A 1.217-g sample of commercial KOH contaminated by K2CO3 was dissolved in
water, and the resulting solution was diluted to 500.0 mL. A 50.00-mL aliquot of this solution was
treated with 40.00 mL of 0.05304 M HCl and boiled to remove CO2. The excess acid consumed 4.74 mL
of 0.04983 M NaOH (phenolphthalein indicator). An excess of neutral BaCl2 was added to another 50.00
mL aliquot to precipitate the carbonate as BaCO3. The solution was then titrated with 28.56 mL of the
acid to a phenolphthalein end point. Calculate the percentage KOH, K2CO3, and H2O in the sample,
assuming that these are the only compounds present.
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