Q: Which of the following is the correct formula for calculating the concentration of a solution in mass percent?

$$\frac{\text{mass of solute}}{\text{mass of solution}} \times 100$$

Question 1

When an ionic solid dissolves in water, ions leave the solid and become dispersed in the solvent. What is the term for a solution that contains the maximum amount of dissolved solute at a given temperature?

Accepted Answer

Saturated solution

Question 2

A solution contains 100 g of solute per 100 g of water. Additional solute can still be dissolved in the solution. What type of solution is this?

Accepted Answer

Unsaturated

Question 3

A student prepares a hot-water extract of caffeine and then places it in an ice bath. Some caffeine crystallizes out. What was the identity of the solution before it was placed in the ice bath?

Accepted Answer

Super saturated

Question 4

In general, as the temperature increases, the solubility of a gas in a liquid ________, and the solubility of most solids in a liquid ________.

Accepted Answer

Decreases, increases

Question 5

Which of the following best describes a supersaturated solution?

Accepted Answer

A solution that contains more solute than the equilibrium concentration

Question 6

If 100 g of NaCl is dissolved in 100 g of water and no more NaCl can dissolve, what type of solution is present?

Accepted Answer

Saturated

Question 7

A solution is prepared by dissolving 120 g of sugar in 100 g of water at a temperature where the equilibrium solubility is 100 g per 100 g water. What is the best description of this solution?

Accepted Answer

Supersaturated

Question 8

Which of the following statements is TRUE regarding the solubility of gases in liquids?

Accepted Answer

Solubility of gases decreases as temperature increases

Question 9

A student adds more solute to a solution and it dissolves. What does this indicate about the solution?

Accepted Answer

It is unsaturated

Question 10

Which of the following best explains why a supersaturated solution is unstable?

Accepted Answer

It contains more solute than it can hold at equilibrium and can precipitate excess solute easily

Question 11

A solution is prepared at a temperature where the solubility of KNO$$_3 is 32 g $$per 100 g water. If 40 g of KNO$$_3 is $$dissolved in 100 g water, what type of solution is formed?

Accepted Answer

Supersaturated

Question 12

Which of the following is the correct formula for calculating the concentration of a solution in mass percent?

Accepted Answer

$$\frac{	ext{mass of solute}}{	ext{mass of solution}} 	imes 100$$

Question 13

If a solution is saturated at 25°C, what will happen if the temperature is increased?

Accepted Answer

The solution will become unsaturated as more solute can dissolve

Question 14

A solution contains 80 g of solute in 100 g of water, and the equilibrium solubility is 100 g per 100 g water. What type of solution is this?

Accepted Answer

Unsaturated

Question 15

Which of the following is most likely to occur when a supersaturated solution is disturbed?

Accepted Answer

The excess solute will precipitate out

Question 16

A solution is prepared by dissolving 50 g of solute in 100 g of water. The solubility limit is 50 g per 100 g water. What type of solution is this?

Accepted Answer

Saturated

Question 17

Which of the following best describes the effect of temperature on the solubility of most solids in water?

Accepted Answer

Solubility increases as temperature increases

Question 18

A solution is described as containing more solute than can be dissolved at equilibrium. Which term best describes this solution?

Accepted Answer

Supersaturated

Question 19

Which of the following is a common method to prepare a supersaturated solution in the laboratory?

Accepted Answer

Dissolve solute in hot solvent and then cool slowly

Question 20

A solution is prepared by dissolving 60 g of solute in 100 g of water. The solubility limit is 80 g per 100 g water. What type of solution is this?

Accepted Answer

Unsaturated

Solutions: Saturation, Solubility, and Temperature Effects

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