Lab 03 Procedure - 13. Reheat the dish for 2 minutes, cool...

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Procedure Experiment 3 Adam Golman 1. Obtain an unknown number from the TA (snap cap jar from the storeroom) 2. Weight the evaporating dish to 0.001 grams and record 3. Add 2.5 grams of the unknown to the evaporating dish, 4. Weigh to 0.001 grams 5. Add 25mL of distilled water to the mixture and stir to dissolve the NaCl 6. After allowing the solids to settle, pour off the water, 7. Repeat this water wash three more times 8. Set up the tripod, wire gauze, and Bunsen burner. 9. Place the evaporating dish on the wire gauze and heat for 5 minutes 10. Using the tongs remove the dish and place it in the desicoller. 11. Allow the evaporating dish to cool for 15-20 minutes 12. Weigh the dish to 0.001 grams and record
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Unformatted text preview: 13. Reheat the dish for 2 minutes, cool and reweigh, record 14. If the weight differ by more than 2%, repeat the 2 minute cooling cycle until the weight difference is less than 2%. 15. Once a stable solid is obtained, very slowly add 25 mL of 1M HCl to the evaporating dish and stir for 2 minutes to react the CaCo 3 . 16. Carefully pour off the liquid so that the solids remain 17. Repeat with 10 mL portion of 1M Hcl two times, then was with a 10mL portion of distilled water. 18. Dry and check for constant weight (less than 2% variation) 19. Weigh the evaporating dish to 0.001 grams record....
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This note was uploaded on 05/14/2008 for the course CHEM 103 taught by Professor Kramer during the Spring '08 term at University of Delaware.

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Lab 03 Procedure - 13. Reheat the dish for 2 minutes, cool...

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