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