Q: Which of the following indicates the most basic solution?

$$[OH^-] = 1 \times 10$$^{-2}$$ M

Question 1

Which of the following is the correct equilibrium expression for the reaction: $$\mathrm{PO_4$^{3-} (aq) + H_2O (l) \rightleftharpoons $$HPO_4$$^{2-} (aq) + OH^- (aq)}$$?

Accepted Answer

$$K = \dfrac{[$$HPO_4$$^{2-}][OH^-]}{[PO_4$^{3-}]}$$

Question 2

Which statement is true regarding the reaction: $$\mathrm{CH_3COOH (aq) + CT^- (aq) \rightarrow CH_3COO^- (aq) + CH_3COOH_2^+ (aq)}$$?

Accepted Answer

The reaction favors the formation of CH$$_3$$COOH$$_2^+.$$

Question 3

Which of the following indicates the most basic solution?

Accepted Answer

$$[OH^-] = 1 	imes 10$$^{-2}$$ M

Question 4

The pH of a $$1 	imes 10$$^{-11}$$ M HCl solution will be:

Accepted Answer

7

Question 5

Acetic acid, CH$$_3$$COOH, is a weak acid ($$K_a = 1.8 	imes 10$$^{-5}$$). Calculate the pH of a 4.6 M HCl/CH_3$COOH solution.

Accepted Answer

pH = 0.34

Question 6

A solution is made with $$[NH_3$] = 0.1 M $$and $$[NH_4$^+] = 0.1 M. $$What is the pH if $$K_b = 1.8 	imes 10$$^{-5}$$?

Accepted Answer

pH = 9.25

Question 7

Which of the following is the correct expression for the concentration of a weak acid in its conjugate acid/base pair?

Accepted Answer

$$\mathrm{pH = pK_a + \log \left(\dfrac{[A^-]}{[HA]}\right)}$$

Question 8

Which of the following is NOT a buffer solution?

Accepted Answer

HCl and NaCl

Question 9

Predict the pH ($$\u003e7$$, $$=7$$, or $$\u003c7) of $$the following solutions: NaBr, KNO$$_3$$, NaNO$$_2$$, CO(NH$$_2$$)$$_2.$$

Accepted Answer

NaBr: 7, KNO$$_3$$: 7, NaNO$$_2$$: \u003e7, CO(NH$$_2$$)$$_2$$: \u003c7

Question 10

Which of the following is a Lewis acid?

Accepted Answer

Al$$^{3+}$$

Question 11

A solution contains 0.20 M NaCl and 0.30 M NaOH. Its pH is:

Accepted Answer

13.48

Question 12

The pH of 1.00 L of buffer containing 1.00 M CH$$_3$$COOH and 1.00 M CH$$_3$$COONa after addition of 0.01 mol NaOH is:

Accepted Answer

4.79

Question 13

Methyl orange is an indicator with a $$K_a of$$ $$1 	imes 10$$^{-4}$$. In acid form, HIn is red, while in base form, In$$^-$$ is yellow. At pH 4.0, the indicator will be:

Accepted Answer

A mixture of red and yellow

Question 14

If you titrate 0.100 M hydrochloric acid (HCl) with 0.08 M NaOH at 25$$^\circC$$, the solution at the equivalence point will be:

Accepted Answer

Slightly acidic

Question 15

In a titration experiment, 25.0 mL of 0.500 M NaOH neutralized 40.0 mL of HCl. The concentration of HCl is:

Accepted Answer

0.313 M

Question 16

Exactly 100.0 mL of 0.100 M HNO$$_3$$ are titrated with 0.100 M NaOH solution. What is the pH at the equivalence point?

Accepted Answer

7.00

Question 17

The correct mathematical expression for finding the molar solubility ($$s) of Sr(OH$$)$$_2 is$$:

Accepted Answer

$$K_{sp} = 4s^3$

Question 18

The molar solubility of silver phosphate, Ag$$_3PO$_4$$, is $$1.6 	imes 10$$^{-5}$$ mol/L. Its solubility product K$$_{sp}$$ is:

Accepted Answer

$$1.57 	imes 10$$^{-18}$$

Question 19

The molar solubility for CaF$$_2 in $$water at 25$$^\circC is$$ $$2.1 	imes 10$$^{-4}$$ M. What is its K$$_{sp}$$?

Accepted Answer

$$1.85 	imes 10$$^{-11}$$

Question 20

The molar solubility of Fe(OH)$$_3$$ ($$K_{sp} = 1.6 	imes 10$$^{-39}$$) at pH 8.00 is:

Accepted Answer

$$1.6 	imes 10$$^{-21}$$ M

Acid-Base Equilibria and Solubility: Practice Exam Study Notes (Chapters 16-17)

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