Question

A solution of ethylene glycol in water at 20 degrees celsius has a mass percent of 9.78% of ethylene glycol with a density of 1.0108 g/mL. The freezing point depression constant for water (solvent for all solutions) is K_f=-1.86 percent celsius kg/mol and the boiling point elevation constant is K_b=0.512 degrees celsius kg/mol. The density of neat water at 20.0 degrees celsius is 0.9982 g/mL. Answer the following:

1. What is the molarity of the solution?

2. What is the molality of the solution?

3. What is the temperature at which this solution will freeze?

4. What is the temperature at which this solution will boil?

5. What is the osmotic pressure of the solution a membrane against pure water?

Why do the answers change so much between ethylene glycol and sodium chloride solutions?

Unlike ethylene glycol, sodium chloride is an ionic compound. Answer 1-5 for a solution of sodium chloride with the mass percent of 9.78% and a density of 1.069.

Answer 1