Match the following aqueous solutions with the appropriate letter from the column on the right. | 1. 0.16 m Zn(NO3)2 | 2. 0.15 m CuCl2 A. Highest boiling point B. Second highest boiling point 3. 0.18 m Bal2 C. Third highest boiling point 4. 0.52 m Sucrose(nonelectrolyte) D. Lowest boiling point
Match the following aqueous solutions with the appropriate letter from the column on the right. | 1. 0.16 m Zn(NO3)2 | 2. 0.15 m CuCl2 A. Highest boiling point B. Second highest boiling point 3. 0.18 m Bal2 C. Third highest boiling point 4. 0.52 m Sucrose(nonelectrolyte) D. Lowest boiling point
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Boiling Point Elevation
The boiling point of a solution INCREASES with the number of dissolved solute particles.
This is summarized by the expression: Tb = m i Kb
Where:
Tb | is the increase in the boiling point | = Tb(solution) - Tb(pure solvent) |
m | is the molality of the solution | = (# moles solute / kg solvent) |
i | is the "van't Hoff" factor | = (# moles of solute particles / mole of solute) |
For nonelectrolytes: | i = 1 | |
For strong electrolytes: | i = number of (cations + anions) | |
For weak electrolytes: | 1 < i < number of (cations + anions) |
Kb is the boiling point elevation constant. It depends only on the SOLVENT.
Example:
Na2SO4 is a soluble salt. It breaks into two Na+ cations and one SO42- anion in solution.
i = 2 + 1 = 3
CH3COOH is a weak acid. It breaks into a few CH3COO - anions and a few H+ cations.
1 < i < 2.
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