Calculate the density of ethanol g/mL 8. Hot plate (Never use a flammable liquid directly on) a. Professor Demonstration b. Place a stirring bar in a 150 mL beaker and add 100 mL of DI water c. Place the beaker on the middle of the hot plate and turn on the stirrer d. Why do you add the stirring bar before the liquid? e. Do you want a super-vigorous stir? Explain
6 9. Hot water bath using a hot plate a. Professor Demonstration b. Make a hot water bath in a 150 mL beaker and record the temperature of boiling water to .5 C C 10. Ice bath a. Professor Demonstration b. Make an ice water bath in a 150 mL beaker and record the temperature to .5 C C 11. How to clean general glassware a. Professor Demonstration i. Clean a dirty piece of general glassware that you have used for this lab ii. How clean does a piece of glassware have to be before you can place it on the dirty glass cart? iii. How can you tell when a piece of glassware is clean? iv. Can you place a labeled piece of glassware on the dirty glass cart? Explain v. What do you do if you break a piece of glassware while cleaning it?
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