Q: A solution is prepared by dissolving 10 g of NaCl in 90 g of water. What is the mass percent of NaCl in the solution?

$$\frac{10}{10+90} \times 100 = 10\%$$

Q: If 100 mL of a 2.0 M NaCl solution is diluted to a final volume of 500 mL, what is the final concentration?

$$C_iV_i = C_fV_f so$$ $$C_f = \frac{2.0\ \mathrm{M} \times 100\ \mathrm{mL}}{500\ \mathrm{mL}} = 0.40\ \mathrm{M}$$

Question 1

Which of the following best describes a solution?

Accepted Answer

A homogeneous mixture where a solute is uniformly dissolved in a solvent.

Question 2

Which of the following combinations is most likely to form a solution based on the rule 'like dissolves like'?

Accepted Answer

A polar solute and a polar solvent

Question 3

Which of the following is a strong electrolyte when dissolved in water?

Accepted Answer

NaCl

Question 4

What is the correct dissociation equation for MgCl$$_2 in $$water?

Accepted Answer

$$\mathrm{$$MgCl_2$$ (s) \rightarrow Mg$$^{2+}$$ (aq) + 2Cl^- (aq)}$$

Question 5

Which of the following statements about osmosis is correct?

Accepted Answer

Osmosis is the movement of water through a semipermeable membrane from low solute concentration to high solute concentration.

Question 6

A solution is prepared by dissolving 10 g of NaCl in 90 g of water. What is the mass percent of NaCl in the solution?

Accepted Answer

$$\frac{10}{10+90} 	imes 100 = 10\%$$

Question 7

Which of the following compounds is most likely to be insoluble in water?

Accepted Answer

BaSO$$_4$$

Question 8

What is the molarity of a solution prepared by dissolving 0.5 mol of glucose (C$$_6H$_{12}O$_6) in $$enough water to make 2.0 L of solution?

Accepted Answer

$$\frac{0.5\ \mathrm{mol}}{2.0\ \mathrm{L}} = 0.25\ \mathrm{M}$$

Question 9

Which of the following best describes a colloid?

Accepted Answer

A heterogeneous mixture with particles that are not easily separable and scatter light.

Question 10

A patient receives an intravenous (IV) solution that is hypotonic relative to their blood plasma. What is the most likely effect on their red blood cells?

Accepted Answer

The red blood cells will swell and may burst.

Question 11

Which of the following is a nonelectrolyte when dissolved in water?

Accepted Answer

C$$_{12}H$_{22}O$_{11} ($$sucrose)

Question 12

If 100 mL of a 2.0 M NaCl solution is diluted to a final volume of 500 mL, what is the final concentration?

Accepted Answer

$$C_iV_i = C_fV_f so$$ $$C_f = \frac{2.0\ \mathrm{M} 	imes 100\ \mathrm{mL}}{500\ \mathrm{mL}} = 0.40\ \mathrm{M}$$

Question 13

Which of the following ions would make AgCl insoluble in water?

Accepted Answer

Ag$$^+$$

Question 14

Which of the following best explains why oil and water do not mix?

Accepted Answer

Oil is nonpolar and water is polar, so they are insoluble in each other.

Question 15

Which of the following is the correct equivalent (Eq) value for 1 mole of Ca$$^{2+}$$ ions?

Accepted Answer

$$1\ \mathrm{mol} 	imes 2 = 2\ \mathrm{Eq}$$

Question 16

A solution is described as supersaturated. Which of the following best describes this solution?

Accepted Answer

It contains more dissolved solute than it can normally hold at that temperature and is unstable.

Question 17

Which of the following best describes a weak electrolyte?

Accepted Answer

A substance that partially dissociates into ions in water.

Question 18

Which of the following would be classified as a suspension?

Accepted Answer

Blood

Question 19

Which of the following best describes the effect of increasing temperature on the solubility of most solid solutes in water?

Accepted Answer

Solubility increases with increasing temperature.

Solutions and Solubility in GOB Chemistry

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