A 3.00-L sample of urban air was bubbled through a solution containing 50.0
mL of 0.0116 M Ba(OH)2, which caused the CO2 in the sample to precipitate as BaCO3. The excess base
was back-titrated to a phe-nolphthalein end point with 23.6 mL of 0.0108 M HCl. Calculate
concentration of CO2 in the air in parts per million (that is, mL CO2/106 mL air); use 1.98 g/L for the
density of CO2.
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