CHE 101-Ch 6 Homework

Which statement is FALSE?

Nonelectrolytes do not dissociate when dissolved in water. (W)

Ionic compounds are typically insoluble in water.

In normal room lighting, the eye cannot distinguish a true solution from a colloidal one.

True

One mole of sodium chloride is added to 100 mL of water in beaker A. One mole of glucose, C6H12O6, is added to 100 mL of water in beaker B. How much more will the freezing point of water be lowered in beaker A than in beaker B?

twice as much

If 5.20 g of HCl is added to enough distilled water to form 3.00 L of solution, what is the molarity of the solution? [Molecular weight: HCl, 36.46 amu]

0.0475 M

Assuming that air is a solution containing four molecules of N2 for every one molecule O2, what is the concentration of O2 in this solution, expressed as % (m/m)? [Formula weights: N2, 28.02 amu; O2, 32.00 amu]

22% (m/m)

A solution contains the label 0.2 M KNO3. What is the correct interpretation of this concentration?

There are 0.2 moles of KNO3 in 1 L of solution.

Which diagram best represents the composition of an aqueous calcium chloride (CaCl2) solution? (water molecules are not shown)

A (W, Try E)

tired B

A solution contains 1.65 g of NaF in a total volume of 150.0 mL. What is its concentration expressed as % (m/V)?

1.10%

What is the osmotic pressure of a 6.0 × 10-2 M NaCl solution at 20°C (293 K)? [R=0.0821 L•atm/mol•K]

2.9 atm

What is the boiling point of a 1.5 m solution of NaCl? [kb = 0.52°C/m]

101.56°C

What happens when a hypotonic solution is separated from a hypertonic solution by an osmotic membrane?

Solute molecules move from the hypotonic solution to the hypertonic solution. (W)

Water molecules move from the hypotonic solution to the hypertonic solution.

An unopened soda bottle at 25°C contains CO2 gas at 6.2 atm. Calculate the equilibrium concentration of CO2 in the unopened soda bottle. [KCO2KCO2 = 3.1 × 10-2 mol/(L•atm)]

0.19 mol/L

A solution that is 1 ppm contains more dissolved solute than one that is 1 ppt.

FALSE

A typical blood serum concentration of HPO42− is 2 meq/L. What is the concentration of this ion expressed in mol/L?

0.001 mol/L (W)

Enough water is added to 50.0 mL of a 0.660 M NaOH solution in order to bring the total volume to 450.0 mL. What is the molarity of this diluted solution?

0.0733 M

Na3PO4 dissolves in water to produce an electrolytic solution. What is the osmolarity of a 2.0 × 10-3 M Na3PO4 solution?

8.0 × 10−3 osmolar

The solubility of gases in liquids is highest at

low temperature and high pressure.

Which statement concerning solution concentration is TRUE?

If a bottle is labeled 0.10 M Ba(OH)2, the concentration of OH- ions in solution is 0.20 M.

Which of the following properly describes a colligative property of a solution?

a solution property that depends on the concentration of solute particles present

Which statement concerning solutions is FALSE?

A solution forms when the solvent and the solute react to form a new substance with one uniform phase.