Q: Which of the following is the correct formula for calculating the concentration of a solution in mass/volume percent (m/v%)?

$$\frac{\text{mass of solute (g)}}{\text{volume of solution (mL)}} \times 100\%$$

Question 1

Which of the following best explains why NaCl dissolves readily in water, as depicted in the images above?

Accepted Answer

The polar water molecules interact with the Na+ and Cl- ions, stabilizing them in solution through ion-dipole interactions.

Question 2

A solution is prepared by dissolving 36.5 g of barium chloride (BaCl$$_2) in $$enough water to make 750.0 mL of solution. What is the molarity of the solution? (Molar mass of BaCl$$_2 = 208.23 g/$$mol)

Accepted Answer

$$0.176\ \mathrm{M}$$

Question 3

Which of the following statements about the solubility of gases in water is correct, as illustrated in the temperature diagrams?

Accepted Answer

The solubility of gases in water decreases as temperature increases.

Question 4

Which of the following mixtures would be classified as a colloid based on the comparison table of solutions, colloids, and suspensions?

Accepted Answer

Milk

Question 5

A student wants to prepare 500.0 mL of a 0.145 M HCl solution from a 12.0 M stock solution. What volume of the stock solution should be used?

Accepted Answer

$$6.04\ \mathrm{mL}$$

Question 6

Which of the following best describes why oil and water do not mix, as shown in the image of two immiscible liquids?

Accepted Answer

Oil is nonpolar and water is polar, so their intermolecular forces are not compatible.

Question 7

Which of the following equations correctly represents the dissociation of sodium sulfate ($$\mathrm{Na_2SO_4}) in $$water?

Accepted Answer

$$\mathrm{Na_2SO_4(s) \rightarrow 2Na^+(aq) + SO_4$^{2-}(aq)}$$

Question 8

Which of the following best explains why a solution of NaCl conducts electricity, but a solution of ethanol (CH$$_3CH$_2OH) $$does not?

Accepted Answer

NaCl dissociates into ions in water, while ethanol does not produce ions.

Question 9

A saturated solution is best described as:

Accepted Answer

A solution that contains the maximum concentration of solute possible at a given temperature.

Question 10

Which of the following ions would NOT form an insoluble sulfide precipitate in ocean vent 'black smoke', according to the solubility rules?

Accepted Answer

$$\mathrm{Na^+}$$

Question 11

Which of the following best describes the process of osmosis as shown in the diagram?

Accepted Answer

Water moves from the side with lower solute concentration to the side with higher solute concentration through a semipermeable membrane.

Question 12

A red blood cell is placed in a hypotonic solution. What will happen to the cell?

Accepted Answer

It will swell and may burst (hemolysis).

Question 13

Which of the following is the correct formula for calculating the concentration of a solution in mass/volume percent (m/v%)?

Accepted Answer

$$\frac{	ext{mass of solute (g)}}{	ext{volume of solution (mL)}} 	imes 100\%$$

Question 14

Which of the following best describes a supersaturated solution?

Accepted Answer

A solution containing more than the maximum quantity of solute predicted to be soluble at a given temperature.

Question 15

Which equation is used to calculate the concentration after dilution?

Accepted Answer

$$V_{	ext{initial}} 	imes M_{	ext{initial}} = V_{	ext{diluted}} 	imes M_{	ext{diluted}}$$

Question 16

According to Beer’s Law, which of the following will NOT increase the absorbance ($$A) of a $$solution?

Accepted Answer

Decreasing the path length ($$b) of $$the sample cell.

Question 17

Which of the following best explains why soap scum forms on bathroom tiles when hard water is used?

Accepted Answer

Soap reacts with calcium and magnesium ions in hard water to form insoluble salts.

Question 18

Which of the following is true about colloids, based on the comparison table?

Accepted Answer

Colloids have larger particles than solutions but do not settle out.

Solutions: Properties, Types, and Quantitative Aspects

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