J. Muench WORKSHEET #12 ________________________ CHEM 161 name 1. For each of the following solutes, decide whether they will be more soluble in H2O or CCl4 or neither. As a hint, the distribution total for each is in parenthesis. Solutes (10): HCl, CS2, NH3, PbCl2, PCl5, CH3OH, CH3(C=O)CH3, C6H6, KCl, BaSO4 Soluble in H2O (5): Soluble in CCl4 (3): Neither (2): 2. What is the percent composition (m/v) of a 0.500M NaCl solution? 3. Hydrochloric acid, HCl, is sold as a 38% (m/m) solution. If this solution has a density of 1.19g/mL, then what is the molarity of this solution? 4. At 63.5oC, the vapor pressure of H2O is 175mmHg and that of ethanol, CH3CH2OH, is 400.mmHg. If 18.0g of water and 23.0g of ethanol are mixed, what is the vapor pressure, in mmHg, of this solution at 63.5oC? Assume that this solution obeys Raoult's Law. 5. A solution is made by adding 30.0g of glucose,C6H12O6 , to 250.mL of water. What is the new boiling point and freezing point of this solution?J. Muench 6. A solution of 0.0581 g of anethole (which is a licorice flavoring) in 5.00g of benzene yielded a freezing-point temperature of 5.098oC. If the normal freezing point for benzene is 5.500o and the Kf for benzene is 5.12oC/m, then what is the MW for the anethole? 7. What is the boiling point (predicted) for a 0.200m aqueous solution of Na2SO4? Remember to include the van't Hoff factor. 8. Two solutions are separated by a semipermeable membrane. Solution A has a concentration of 5% glucose while solution B has a concentration of 10% glucose. a. which solution has the higher osmotic pressure? A or B b. which direction will the solvent flow? A B or B A c. which solution will increase in total volume? A or B 9. Rank the solutions from lowest osmotic pressure to highest osmotic pressure. Note - you do not need to calculate each one - just multiply the van't Hoff factor (if it has one) times the molarity. RANK (#1 = highest) a. 0.15M NH3 b. 0.10M NaCl c. 0.075M CaCl2 d. 0.125M C6H12O6 (glucose) e. 0.075M Al(NO3)3 10. For each of the examples, determine first whether it is a solution or a colloid. If it is a colloid, then determine its type (aerosol, emulsion, etc.). a. a gas tank containing He and O2 d. club soda b. milk e. peanut butter c. air freshener spray f. vodka (a mixture of ethanol and