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Unformatted text preview: Name: ___________________________________ CH101 Freezing Point Depression, Boiling Point Elevation – Study Guide sections 12.5, 12.6, 12.7 in the textbook Molality (section 12.5) Write the definition of molality: How does molality differ from molarity? Molality, unlike molarity, is independent of _______________________. example: What is the molality of a solution prepared by dissolving 3.41 g. C6H12O6 in 85.0 mL water? 3.41 g C6 H12 O 6 85.0 g H 2 O 3.41 g C6 H12 O 6 moles C6 H12 O 6 =? 85.0 g H 2 O kg H 2 O x 103 g H 2 O 1 kg H 2 O x 1 mole C6 H12 O 6 mole C6 H12 O 6 = 0.222 = 0.222 m C6 H12 O 6 kg H 2 O 180.1 g C6 H12 O 6 Freezing Point Depression (section 12.6) A colligative property is one that depends on ________________________________________. When a nonvolatile solute is dissolved in a solvent, the vapor pressure of the resulting solution is _______________ (higher than, lower than, the same as) the vapor pressure of the pure solvent. If the vapor pressure of a solution is lowered, the freezing point of that solution is ______________ (raised, lowered) and the boiling point is ______________ (raised, lowered). The amount by which the vapor pressure is lowered is proportional to the ________________ (molarity, molality, percent, mole fraction) of the solute. Watch video tutorial on Blackboard Boiling Point Elevation (section 12.6) The presence of a dissolved nonvolatile solute in a solution caused the boiling point to be ___________________(raised, lowered) compared to that of the pure solvent. Colligative Properties of Ionic Solutions (section 12.7) For nonelectrolyte solutions, i = _____. For strong electrolytes, i = number of _________________________ per mole of solute dissolved. Watch video tutorial on Blackboard example: CaCl2 dissolves yielding three ions, one Ca+2 ion and two Cl‐ ions, thus i = 3 (NH4)3P dissolves yielding four ions, three NH4+ ions and one P‐3 ion, thus i = 4. End of Chapter Practice Problems Tro First Edition: #75, 77, 83, 85 Tro Second Edition: #77, 79, 85, 87 answers are located in Appendix III of the textbook Take the Quiz on Blackboard 2 ...
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This note was uploaded on 11/11/2011 for the course MATH 180 taught by Professor Byrns during the Spring '11 term at Montgomery College.

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