Chemistry 121
QUANTITATIVE ANALYSIS
Problem Set #1: Treatment of Analytical Data; Stoichiometry
August 30, 1999
DUE: September 15, 1999
Problems in HARRIS
| Chapter 3 (pp. 50-67): |
#1, 2, 5, 11, 14abc
|
| Chapter 4 (pp. 68-91): |
#A, 14, 22
|
| Chapter 5 (pp 92-111): |
#A |
| Chapter 1 (pp. 12-27): |
#31 |
Additional Problems
- The Ti content (wt%) of two different ore samples
was measured several times by the same method. Are the mean values
significantly different at the 95% confidence level?
-
Sample 1: 0.0134 0.0138 0.0128 0.0133 0.0137
-
Sample 2: 0.0135 0.0142 0.0137 0.0141 0.0143
- A sample weighs 0.2500 grams and contains chloride. The chloride is
precipitated as AgCl. What is the %-Cl in the sample if the precipitate weighs
0.7476 grams?
- Iron is often determined titrimetrically. A sample of iron is dissolved
and all of the iron is converted to Fe2+, which is then titrated with
a K2Cr2O7 solution. What is the %-Fe in a 0.5285-gram sample
that requires 26.87 milliliters of a 0.01524 M K2Cr2O7 solution
before an endpoint is reached? The reaction is:
Cr2O72- + 6Fe2+ + 14H+ --> 2Cr2+ + 6Fe3+ + 7H2O
Created and copyright by Joel M. Goldberg. Last updated: August 27,
1999
Back to
Chem 121 HomePage
jgoldber@zoo.uvm.edu