Question 1

Which of the following best describes a saturated solution of NaCl at 25 °C?

Accepted Answer

A solution in which no more NaCl can dissolve and any added NaCl will remain undissolved.

Question 2

If you increase the temperature of a saturated solution of NaCl, what will happen to the concentration of dissolved NaCl?

Accepted Answer

The concentration will increase because solubility of most solids increases with temperature.

Question 3

Which of the following compounds is most likely to be miscible with water?

Accepted Answer

Ethanol ($$\mathrm{C_2H_5OH})$$

Question 4

A solution contains 35 g of NaCl in 100 mL of water at 25 °C. If more NaCl is added, what will happen?

Accepted Answer

The added NaCl will remain undissolved at the bottom.

Question 5

Which of the following best explains why $$\mathrm{CO_2$} is $$more soluble in water than $$\mathrm{N_2$} at $$the same temperature and pressure?

Accepted Answer

$$\mathrm{CO_2$}$$ has a higher Henry’s Law constant ($$k) $$than $$\mathrm{N_2$}.$$

Question 6

Which vitamin would you expect to be most soluble in water based on its structure?

Accepted Answer

Vitamin C

Question 7

According to Henry’s Law, what is the equation relating the solubility of a gas to its pressure?

Accepted Answer

$$S_g = kP_g$$

Question 8

A sealed bottle of soda is opened at room temperature. What happens to the solubility of $$\mathrm{CO_2$} in $$the soda?

Accepted Answer

The solubility decreases because the pressure above the liquid decreases.

Question 9

Which of the following statements is true regarding the effect of temperature on the solubility of gases in water?

Accepted Answer

The solubility of gases decreases as temperature increases.

Question 10

A solution is prepared by dissolving 0.5 mol of $$\mathrm{O_2$} in 1 L of $$water at 1 atm and 20 °C. Given $$k = 1.4 	imes 10$$^{-3}$$ mol/L·atm for $$\mathrm{$$O_2$$}$$, what is the expected equilibrium concentration of dissolved $$\mathrm{$$O_2$$}$$?

Accepted Answer

$$1.4 	imes 10$$^{-3}$$ mol/L

Question 11

Which of the following best describes a supersaturated solution?

Accepted Answer

A solution that contains more dissolved solute than is stable at a given temperature.

Question 12

Which of the following would increase the concentration of a saturated solution of NaCl?

Accepted Answer

Increasing the temperature of the solution.

Question 13

Which of the following pairs of substances are most likely to be miscible?

Accepted Answer

Ethanol and water

Question 14

A student adds a seed crystal to a supersaturated solution and observes rapid crystallization. What does this demonstrate?

Accepted Answer

The solution was supersaturated and unstable.

Question 15

Which of the following best explains why vitamins A, D, E, and K are stored in fatty tissue?

Accepted Answer

They are nonpolar and soluble in nonpolar solvents.

Question 16

Which of the following is a correct application of the phrase 'like dissolves like'?

Accepted Answer

Polar solutes dissolve in polar solvents due to similar intermolecular forces.

Question 17

If the partial pressure of $$\mathrm{O_2$}$$ above water is doubled, what happens to the solubility of $$\mathrm{O_2$} in $$water according to Henry’s Law?

Accepted Answer

It doubles.

Question 18

Which of the following best explains why the solubility of most solids increases with temperature?

Accepted Answer

Dissolving a solid is usually endothermic, so higher temperature favors dissolution.

Question 19

A patient is given a vitamin supplement containing both vitamin C and vitamin A. Which vitamin will be more readily absorbed if taken with water?

Accepted Answer

Vitamin C

Question 20

Which of the following statements about the solubility of gases is correct?

Accepted Answer

The solubility of gases in water decreases as temperature increases.

Saturated Solutions, Solubility, and Factors Affecting Solubility

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