Lab 11 - freezing point depression

Lab 11 - freezing point depression - AP chemistry lab...

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Unformatted text preview: AP chemistry lab Stuyvesant High School 2010-2011 Adapted from Experimental Chemistry, 7 th ed. James F. Hall. S. OMalley, 2010 LAB 11 ICE CREAM LAB Mixing salt with ice causes the temperature to drop for two reasons: The dissolving of salt in water is endothermic : NaCl(s) Na + (aq) + Cl- (aq); H = +3.88 kJ The dissolving of salt in water depresses the freezing point: T f = i K f m MATERIALS 1. ice ................................................................................................................1 bag per class 2. thermometer ................................................................................................10 per class 3. gallon-size zip-lock freezer bags .................................................................10 per class 4. quart-size zip-lock freezer bags ...................................................................10 per class 5. cream ...........................................................................................................5 pints per class cream ....
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