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 à BaCO3 + 2 NaOH
NaHCO3 + Ba(OH)2 à BaCO3 + NaOH + H2O
What was the percentage of NaHCO3 in the original mixture?
ANSWER: 39.5% NaHCO3
Answer: 39.51 % NaHCO3