Experiment 2
Gravimetric Determination of Water of Hydration


PRELAB QUESTIONS

References:
Ebbing, "General Chemistry", 5th ed., pp. 71, 132-138 (Hydrate; Mass and Moles of Substance).

Learning Center:
SSM Lesson 1 (pp. 11-12) (% composition); answers to pre and post-lab questions

SHOW SET-UP FOR ALL PROBLEMS

1. Calculate the experimental percent water in NiC2O4·2H2O if a student found that a 2.491 g sample of NiC2O4·2H2O had a mass of 1.926 g after drying. Report answer using proper number of significant figures and units.

2. Calculate the theoretical percent water in NiC2O4·2H2O. Use as many significant figures as reported in the answer to question 1.

3. A student experimentally determined the percent water in two separate samples of an unknown hydrate. The values were 37.6% for sample 1 and 35.3% for sample 2. Calculate the range of percent water for these determinations.

4. Write the balanced equation for the reaction where Na2CO3·10H2O is heated to drive off the water of hydration.

 

1. Safety
2.
 Objectives/Overview
3.
 Procedures
4. Observations
5.
 Equipment
6.

View Techniques:
A. Lighting the Bunsen Burner
B. Heat, Cool, and Weigh Cruicibles
C. Heat, Cool, and Weigh Crucibles with Sample

D. Repeat Heating, Cooling, Weighing Crucibles with Sample
7. Waste Disposal/Clean-up
8.

Calculations/Setups
9. Conclusions
10. Grading Scale
11. Review Prelab Questions
12.
 Review Postlab Questions
 
   
 
 
 

 

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