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? Add tap water until 2/3 of the ice is covered.
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CHEM 1412 Dallas College Molar Mass Determination Chemistry Lab Report
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? Add tap water until 2/3 of the ice is covered.
? Stir vigorously with your stirring rod.
2. Measure 20.0 mL distilled water into a large test tube.
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? Stir vigorously with your stirring rod.
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CHEM 1412 Dallas College Molar Mass Determination Chemistry Lab Report
p 3
? Add tap water until 2/3 of the ice is covered.
? Stir vigorously with your stirring rod.
2. Measure 20.0 mL distilled water into a large test tube.
3. Insert a thermometer into the liquid in the large test tube.
4. Insert the test tube into the ice water bath. Make sure the ice bath water
level is above the level of the liquid inside the test tube. If it is not, add
more ice, salt and water.
5. Record the temperature of the liquid inside the test tube every 30
seconds.
6. Continue to stir until the liquid inside the test tube starts to freeze. When
the liquid starts to freeze, do not stir anymore. Be careful not to break the
thermometer by stirring it in ice! Mark the temperatures where the liquid
starts to freeze. (by an asterisk or highlight or something.)
7. Continue to monitor until the temperature is fairly constant.
8. Record the data on your Report Sheet.
9. When done, remove the large test tube from the ice bath and melt the ice
inside with the warmth of your hands or under running water.
Lab Technique Tip: Do not remove the thermometer until the liquid inside is
melted or your thermometer may break.
PART II: Freezing Point of the Solution
1. Weigh 2.0 g of unknown F (a nonelectrolyte.)
2. Record exact weight to 0.01g on your report sheet.
3. Dissolve it in the same 20.0 mL of water inside the large test tube from
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