Colligative Properties

When KCl (potassium chloride) is dissolved in water, how many particles are in solution for each unit?

• 1

• 2

• 3

• 4

• 6

What type of substance dissolves in water but does not form ions or conduct electricity?

• electrolyte

• nonelectrolyte

• saturated

• insoluble

Colligative properties depend on the _____ of solute particles in solution.

• type
• number
• pH
• nature

The freezing point of a solution is ____ the freezing point of the pure solvent.

• the same as
• lower than
• higher than
• no relation to

The boiling point of a solution is ______ the boiling point of the pure solvent.

• higher than
• the same as
• lower than
• higher or lower than

Electrolytes have a greater effect on colligative properties than nonelectrolytes do because electrolytes

• are volatile

• have higher boiling points

• produce fewer moles of solute particles per mole of solvent

• produce more moles of solute particles per mole of solvent

Calculate the freezing point of a solution made from 32.7 g of propane, C3H8, dissolved in 137.0 g of benzene, C6H6. The freezing point of benzene is 5.50° C and its Kf is 5.12° C/m.

• -22.2° C

• -22.3° C

• -22.4° C

• -22.5° C

Calculate the boiling point of a solution made from 227 g of MgCl2 dissolved in 700. g of water. What is the boiling point of the solution? Kb = 0.512° C/m.

• 105.24° C

• 105.34° C

• 105.44° C

• 105.54° C

What mass of water is needed to dissolve 34.8 g of copper(II) sulfate in order to prepare a 0.521 m solution?

• 0.418

• 0.419

• 0.420

• 0.421

What is the normal boiling point of a 2.70 M solution of KBr that has a density of 1.80 g/ml? ( Kb for H2O is 0.512 °C .kg/mole)