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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- Fall '08
- Chemistry, Magnesium, Oxide, Crucible Lid