Homework Help: Chemistry

Posted by Hannah on Monday, February 20, 2012 at 9:46pm.

had to perform an experiment for the freezing point depression in which we had to determine the frezzing points of water as a pure solvent, sodium chloride, sucrose, and ethylene glycol.
We had to work with a partner so I completed the experiment for water, NaCl, and the glycol and had to get the info for sucrose from my partner. The data that was collected was the freezing pint of DI water which was the corrected value for the thermometer that I used. We had to record the temp every 30 seconds until we saw ice crystals. We had to do the same thing for the NaCl, sucrose, and gycol. For the NaCl we started at 0.5 min in which the temp was 15.0 degrees celsius and crystals formed at 10.5 min at -2.0 degrees celsius.

For both NaCl and sucrose we had to mix it with 100ml of water so for the mass of solvent (kg) I would do
100mL X 1.00g/mL = 100g and then to get kg I would divide by 1000 so 0.1kg. This would be the answer for sucrose as well. Is this correct?

Chemistry - DrBob222, Monday, February 20, 2012 at 11:01pm
kg solvent is 0.1kg for 100 mL H2O.

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