Chapter 12 Lecture Problems
Concentration
- Calculate the concentration (molarity) of a solution prepared by dissolving 12.00 grams of potassium chloride in water and diluting to 250.0 mL.
- Calculate the concentration (molality) of a solution prepared by dissolving 12.00 g of KCl in 250.0 mL of water at 20 °C.
- Calculate the concentration (mole fraction) of KCl in a solution prepared by dissolving 12.00 g of KCl in 250.0 mL of water at 20 °C.
- Calculate the concentration (weight percent) of KCl in a solution prepared by dissolving 12.00 g of KCl in 250.0 mL of water at 20 °C.
- Calculate the ppm by mass of KCl in a solution prepared by dissolving 0.01200 g of KCl in 250.0 mL of water at 20 °C.
- Solutions
Colligative Properties
- Lecture Problem: How much CO2 (grams) will dissolve in 2 L of water when PCO2 = 4 atm and the temperature is 25 oC. kH = 4.48 x 10-5 M mmHg-1.
- Lecture Problem: Mix 100 g of water (vapor pressure 23.756 torr) with 500 g methanol, CH3OH (vapor pressure 15.68 torr). Calculate Pwater, PMethanol, Ptotal.
- Lecture Problem: Add 20.00 g fructose (C6H12O6) to 500 mL H2O. What is the freezing point? What is the boiling point?
- Lecture Problem: Add 20.00 g NaCl to 500 mL H2O. What is the freezing point? What is the boiling point?
- Lecture Problem: What pressure is required to purify seawater using reverse osmosis? Assume that the initial concentration of NaCl is approximately 0.5 mole liter-1 and that it must be purified to 1x10-4 mole liter-1.
- Solutions:
This page is maintained by
Scott Van Bramer
Department of Chemistry
Widener University
Chester, PA 19013
Please send any comments, corrections, or suggestions to
svanbram@science.widener.edu.
This page has been accessed
times since 5/30/97.
Last Updated Friday, May 25, 2001 2:10:36 PM