Q: If the pH of a solution is 3, what is the $$[\mathrm{H_3O^+}]$$ concentration?

$$1 \times 10$$^{-3}$$\ \mathrm{M}$$

Question 1

Which of the following best describes a colloid?

Accepted Answer

A homogeneous mixture with particles large enough to scatter light but not settle out.

Question 2

Which of the following statements about the effect of temperature on solubility is correct?

Accepted Answer

The solubility of most solids in water increases as temperature increases.

Question 3

A solution is prepared by dissolving 0.50 mol of NaCl in enough water to make 1.0 L of solution. What is the molarity ($$M) of $$the solution?

Accepted Answer

$$0.50\ M$$

Question 4

Which of the following best describes a saturated solution?

Accepted Answer

A solution in which no more solute can dissolve at a given temperature.

Question 5

Which of the following equations correctly represents the dissociation of calcium chloride ($$\mathrm{$$CaCl_2$$}) in $$water?

Accepted Answer

$$\mathrm{$$CaCl_2$$\ (s) \rightarrow Ca$$^{2+}$$\ (aq) + 2\ Cl^-\ (aq)}$$

Question 6

A patient receives 500 mL of a 0.9% (w/v) NaCl solution intravenously. How many grams of NaCl are administered?

Accepted Answer

$$4.5\ \mathrm{g}$$

Question 7

Which of the following best describes the direction of osmosis when a red blood cell is placed in a hypertonic solution?

Accepted Answer

Water moves out of the cell, causing it to shrink.

Question 8

Which of the following is a property of a strong acid?

Accepted Answer

It completely ionizes in aqueous solution.

Question 9

Which of the following is the correct balanced equation for the neutralization of hydrochloric acid ($$\mathrm{HCl}) $$with sodium hydroxide ($$\mathrm{NaOH}$$)?

Accepted Answer

$$\mathrm{HCl\ (aq) + NaOH\ (aq) \rightarrow NaCl\ (aq) + H_2O\ (l)}$$

Question 10

Given the equilibrium: $$\mathrm{CH_3COOH\ (aq) + H_2O\ (l) \rightleftharpoons CH_3COO^-\ (aq) + H_3O^+\ (aq)}$$, which is the conjugate base?

Accepted Answer

$$\mathrm{CH_3COO^-}$$

Question 11

If the pH of a solution is 3, what is the $$[\mathrm{H_3O^+}]$$ concentration?

Accepted Answer

$$1 	imes 10$$^{-3}$$\ \mathrm{M}$$

Question 12

Which of the following statements about Le Chatelier’s principle is correct?

Accepted Answer

If a system at equilibrium is disturbed, it will shift to counteract the disturbance.

Question 13

A buffer solution is made from acetic acid ($$\mathrm{CH_3COOH}$$, $$pK_a = 4.76) $$and sodium acetate. If the ratio $$\left( \frac{[\mathrm{A^-}]}{[\mathrm{HA}]} \right) is 10$$, what is the pH of the solution? (Use the Henderson-Hasselbalch equation: $$\mathrm{pH = pK_a + \log \left( \frac{[A^-]}{[HA]} \right)})$$

Accepted Answer

$$5.76$$

Question 14

Which of the following is NOT a strong acid?

Accepted Answer

$$\mathrm{CH_3COOH}$$

Question 15

A pharmaceutical weak acid has a $$pK_a of 5.0. If $$the pH of the blood is 7.4, which form predominates?

Accepted Answer

The deprotonated (A$$^-) $$form

Question 16

Which of the following best describes active transport across a cell membrane?

Accepted Answer

Movement of molecules against their concentration gradient using energy.

Question 17

If a solution has a pH of 8, which of the following statements is true?

Accepted Answer

The solution is basic.

Question 18

Which of the following is the correct equilibrium expression for the reaction: $$\mathrm{N_2$\ (g) + 3H_2\ (g) \rightleftharpoons 2NH_3\ (g)}$$?

Accepted Answer

$$K = \frac{[\mathrm{NH_3$}]^2}{[\mathrm{N_2$}][\mathrm{H_2$}]^3}$$

Question 19

A 10 mL sample of 6.0 M HCl is diluted to a final volume of 100 mL. What is the final concentration?

Accepted Answer

$$0.60\ M$$

Solution Chemistry and Acid-Base Equilibria: Study Guide for CHEM 102 Exam 4 (Ch. 8-9)

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