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Q3. Give four factors that determine the suitability of drying agent in drying organic liquids

Q3. Give four factors that determine the suitability of drying agent in drying organic liquids

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Q3. Give four factors that determine the suitability of drying agent in drying organic liquids
Transcribed Image Text:Q3. Give four factors that determine the suitability of drying agent in drying organic liquids
EXPERIMENTAL PROCEDURE: 1. In a 100 ml round-bottomed flask, weigh out, accurately to two (or four) decimal places, 20 ml of distilled water (bp 100 °C). Record the mass into your results report 2. In the same flask, weigh out, accurately to two (or four) decimal places, 20 ml of acetone (bp 56 °C). Record the mass into your results report 3. To the mixture in the flask, add few boiling chips. Boiling chips prevent superheating of the liquid and reduces the tendency of bumping 4. Assemble the apparatus according to Figure 1 above. The joints should be sealed tightly. You must have your set-up checked by your instructor before you start the distillation process. 5. Weigh out, accurately to two (or four) decimal places, a labeled (A) empty dry conical flask. Record the mass into your results report 6. Weigh out, accurately to two (or four) decimal places, a labeled (W) empty dry conical flask. Record the mass into your results report 7. Carefully heat the flask on a hot plate. Collect the first boiling component (acetone, bp 56 °C) in a third conical flask C 8. Collect the second boiling component (water, bp 100 °C) in conical flask W that you pre- weighed in step 6 9. Continue the distillation until about 5 ml of the liquid mixture is left in the distillation flask 10. At this stage, stop the distillation by turning the heat off 11. Now weigh conical flask W containing water. Calculate the mass of water obtained 17 12. To conical flask C containing acetone, add small amount of anhydrous CaCl2. Swirl the flask gently. Anhydrous CaCl2 is a drying agent that absorbs any water present. When you have added CaCl2, if it sticks to the flask, the liquid is still wet. This means more anhydrous CaCl2 should be added. When enough drying agent has been added, it should move freely upon swirling the flask. This is an indication of dryness, which means that all water that might have been present, has now been removed and absorbed by the drying agent (see next page for details). 13. Gravity-filter the dry acetone into conical flask A that you pre-weighed in step 5 14. Now weigh conical flask A containing dry diethyl ether. Calculate the mass of dry acetone obtained 15. Hand in your dry acetone sample to your instructor along with your report
Transcribed Image Text:EXPERIMENTAL PROCEDURE: 1. In a 100 ml round-bottomed flask, weigh out, accurately to two (or four) decimal places, 20 ml of distilled water (bp 100 °C). Record the mass into your results report 2. In the same flask, weigh out, accurately to two (or four) decimal places, 20 ml of acetone (bp 56 °C). Record the mass into your results report 3. To the mixture in the flask, add few boiling chips. Boiling chips prevent superheating of the liquid and reduces the tendency of bumping 4. Assemble the apparatus according to Figure 1 above. The joints should be sealed tightly. You must have your set-up checked by your instructor before you start the distillation process. 5. Weigh out, accurately to two (or four) decimal places, a labeled (A) empty dry conical flask. Record the mass into your results report 6. Weigh out, accurately to two (or four) decimal places, a labeled (W) empty dry conical flask. Record the mass into your results report 7. Carefully heat the flask on a hot plate. Collect the first boiling component (acetone, bp 56 °C) in a third conical flask C 8. Collect the second boiling component (water, bp 100 °C) in conical flask W that you pre- weighed in step 6 9. Continue the distillation until about 5 ml of the liquid mixture is left in the distillation flask 10. At this stage, stop the distillation by turning the heat off 11. Now weigh conical flask W containing water. Calculate the mass of water obtained 17 12. To conical flask C containing acetone, add small amount of anhydrous CaCl2. Swirl the flask gently. Anhydrous CaCl2 is a drying agent that absorbs any water present. When you have added CaCl2, if it sticks to the flask, the liquid is still wet. This means more anhydrous CaCl2 should be added. When enough drying agent has been added, it should move freely upon swirling the flask. This is an indication of dryness, which means that all water that might have been present, has now been removed and absorbed by the drying agent (see next page for details). 13. Gravity-filter the dry acetone into conical flask A that you pre-weighed in step 5 14. Now weigh conical flask A containing dry diethyl ether. Calculate the mass of dry acetone obtained 15. Hand in your dry acetone sample to your instructor along with your report
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