| 1. | Safety |
| 2. |
Objectives/Overview |
| 3. |
Procedures |
|
4. |
Observations |
| 5. | |
| 6. | |
| 7. | Conclusions |
| 8. | Grading Scale |
| 9. | Review Prelab Questions |
|
10. |
Review Postlab Questions |
Experiment
21
Qualitative
Analysis of a Salt Unknown
PRE-LABORATORY QUESTIONS
References:
Brown, Lemay, and Bursten, Chemistry the Central Science, 8th ed.
(2000)
pp. 109-113 (solubility, precipation reactions,ionic equations)
pp. 117-119 (neutralization reactions)
pp. 593-618 (strong and weak acids and bases, pH)
pp. 621-622 (pH effects of salts)
pp. 644-650 (buffers)
pp. 659-669 (solubility and Ksp);
pp. 669-674 (separation of metallic ions via precipitation and solubility
criteria).
Learning Center:
SSM Lesson 5 (net ionic equations)
Writing NIE ; Solving "who-done-its" (study guides); answers
to pre- and post-lab questions.
SHOW A SET-UP FOR ALL PROBLEMS
1. Which of the following soluble salts would be predicted to form acidic solutions? (circle)
| Ca(CH3COO)2 | (NH4)2SO4 | Fe2(SO4)3 | Na2CO3 | BaI2 |
| Bi(NO3)3 | Ca(NO2)2 | CuCl2 | KBr | CrCl3 |
2. Which of the following soluble salts would be predicted to form
basic solutions? (circle)
| Ca(CH3COO)2 | (NH4)2SO4 | Fe2(SO4)3 | Na2CO3 | BaI2 |
| Bi(NO3)3 | Ca(NO2)2 | CuCl2 | KBr | CrCl3 |
3. Which of the following soluble salts would be predicted to form
neutral solutions? (circle)
| Ca(CH3COO)2 | (NH4)2SO4 | Fe2(SO4)3 | Na2CO3 | BaI2 |
| Bi(NO3)3 | Ca(NO2)2 | CuCl2 | KBr | CrCl3 |
4. Which of the following cations will precipitate from a solution
that is 0.10 M in the cation if the concentration of sulfide ion is
maintained at 7.0 x 10-22 M? (Show your calculations and
explain your reasoning!)
Pb2+ (Ksp = 7 x 10-29 for PbS)
Co2+ (Ksp = 5 x 10-22 for CoS)
Mn2+ (Ksp = 2.3 x 10-13 for MnS)
