| 1. | Safety |
2. |
Objectives/Overview |
3. |
Procedures |
| 4. | Observations |
5. |
Equipment |
| 6. | |
| 7. | Calculations/Set-ups |
| 8. | Conclusions |
| 9. | Grading Scale |
10. |
Review Prelab Questions |
| 11. | Review Postlab Questions |
Experiment
6
Molar Mass Determination by Titration
PRELAB QUESTIONS
References:
Ebbing, "General Chemistry", 5th ed., pp. 92-95 (net ionic equations),
pp. 98-105 (neutralization reactions), pp. 157-160 (calculations involving
solutions).
Learning Center:
-
ECU Lesson 44A (molarity);
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ECU Lesson 46 (titration);
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WEN Module 12 (problems 8, 11) (molarity );
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WEN Module 17 (problems 3, 8, 9) (titration).
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"Exploring chemistry" videodisks (Acid, Base, disk); answers to pre and post-lab questions.
SHOW SET-UP FOR ALL PROBLEMS
1. What mass of solid NaOH is needed to make 500.0 mL of 0.2532 M NaOH solution?
2. What volume of 7.0 M NaOH is needed to make 25.00 mL of 2.5 M NaOH?
3. Determine the concentration of NaOH if 32.51 mL of 0.1000M H2SO4 is needed to neutralize 15.00 mL of NaOH according to the following balanced equation:
2NaOH(aq) + H2SO4(aq) ----> Na2SO4(aq) + 2H2O(l)
4. Determine the molar mass of an unknown acidic solid if 1.235 g of acid is neutralized by 28.46 mL of 0.1922M NaOH. The unknown acid and NaOH react in a 1:1 mole ratio.
5. Read and record the volume of liquid in the following burets:
