CHM 2045C Sample M-5 Exam Name:____________

Module 5 Part 0: Mixture Problem 4 points


A mixture of NaHCO3 and Na2CO3 weighed 1.0235 g. The dissolved mixture was reacted with excess Ba(OH)2 to form 2.1028 g of BaCO3 by the following reaction:


Na2CO3 + Ba(OH)2 BaCO3 + 2 NaOH


NaHCO3 + Ba(OH)2 BaCO3 + NaOH + H2O


What was the percentage of NaHCO3 in the original mixture?





















ANSWER: 39.5% NaHCO3
































Answer: 39.51 % NaHCO3