Lab 4 procedure - 10 Occasionally li³ the lid to allow air...

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1. Obtain a clay triangle and a clay crucible. Adjust the ring stand so that the flame is about an inch below the crucible. 2. Adjust the burner for a blue flame. Make sure the lid is ajar and heat the crucible at a low level for 3 minutes. Heat at a high level for 5 minutes. Turn off the gas. 3. Use the forceps to close the crucible lid. Place crucible on the wire gauze. 4. Let crucible cool to room temperature. 5. Take the crucible/lid to the analytical balance. Weigh the crucible and record in data sheet. 6. Repeat the procedure until the weighs are within +/- .002g of each other. If they are not within that increment, do a third measurement. 7. Obtain 0.4g – 0.6g of magnesium ribbon (4-6 strips) and weigh to make sure the mass is correct. Wad the ribbon up. 8. Place magnesium ribbon in the crucible and weigh. Record in data sheet. 9. Heat crucible with the lid off for 3 minutes on a low flame. Increase the flame and observe the magnesium. When combustion occurs, put the lid on.
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Unformatted text preview: 10. Occasionally li³ the lid to allow air in the crucible. 11. When there is no more white smoke, take the lid o± and heat crucible For 5-10 minutes. 12. Turn o± the gas and let the crucible and lid cool with the lid o±. 13. Obtain a Few millimeters oF r.o. water From white tap in 50mL beaker. 14. When there is no more radiant heat, add 10 drops oF water to the crucible. 15. With the lid ajar, heat gently For 5 minutes and then strongly For 10. 16. Turn o± the gas and led crucible and lid cool with the lid on. Record weight oF crucible, lid, and magnesium oxide (´rst hea²ng) 17. Repeat the procedure and weigh. Measure and record that mass in your data sheet. 18. IF the weights are within +/- 0.002g, you have reached constant weight. Otherwise, heat a third ²me. 19. Gently tap the crucible into the designated waste container 20. Return the crucible and lid....
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