-Electrolytes & Colligative Properties cont'd.

-the actual values of the colligative properties for all strong electrolytes are almost always what would be expected based on the number of particles they produce in solution

-the differences are caused by attractive forces between dissociated ions in aqueuous solution

-according to Debye & Huckel, a cluster of hydrated ions acts as a single ion rather than as individual ions, causing effective total concentration to be less

-Ions of higher charge have lower effective concentrationss than ions with smaller charge

Multiple Choice

1. Acetic acid is a weak electrolyte because it

D. ionizes only slightly in aqueuous solution

2. Which of the following solutions would contain the highest concentration of hydronium ions?

A. 0.10 M HCl

3. Which of the following is the best representation of the precipitation reaction that occurs when aqueuous solutions of sodium carbonate and calcium chloride are mixed?

C. CO3(2-) (aq) + Ca(2-) --> CaCO3(s)

4. Which of the following is not a colligative property?

A. molality

5. Solution A contains 0.1 mol of sucrose, C12H22O11, dissolved in 5oo g of water. Solution B contains 0.1 mol of sodium chloride, NaCl, in 500 g of water. Which of the following is true?

C. Solution A would freeze at a higher temperature than Solution B would.