Question 1

Which of the following best describes the Arrhenius definition of an acid?

Accepted Answer

A substance that increases the concentration of H+ ions when dissolved in water.

Question 2

Which of the following household substances is most likely to have a pH less than 7?

Accepted Answer

Vinegar

Question 3

According to the Brønsted-Lowry definition, which of the following is a base in the reaction $$ \mathrm{NH_3$} + \mathrm{H_2O} \rightarrow \mathrm{NH_4$^+} + \mathrm{OH^-} $$?

Accepted Answer

$$ \mathrm{NH_3$} $$

Question 4

Which of the following is an example of a conjugate acid-base pair?

Accepted Answer

$$ \mathrm{H_2O} $$ and $$ \mathrm{OH^-} $$

Question 5

If the concentration of $$ [\mathrm{H^+}]  in a $$solution is $$ 1.0 	imes 10$$^{-3}$$  M$$, what is the pH of the solution?

Accepted Answer

pH = 3

Question 6

A solution has a pOH of 4. What is its pH at 25°C?

Accepted Answer

pH = 10

Question 7

Which of the following statements about the autoionization of water is correct?

Accepted Answer

It produces equal concentrations of $$ \mathrm{H^+} $$ and $$ \mathrm{OH^-}  in $$pure water.

Question 8

Which of the following is a polyprotic acid?

Accepted Answer

$$ \mathrm{H_2SO_4} $$

Question 9

Given the reaction $$ \mathrm{$$HSO_3$$^-} + \mathrm{H_2O} \rightarrow \mathrm{SO_3$^{2-}} + \mathrm{H_3O^+} $$, what role does $$ \mathrm{$$HSO_3$$^-} $$ play?

Accepted Answer

Brønsted-Lowry acid

Question 10

Which of the following best explains why lemon juice tastes sour?

Accepted Answer

It contains citric acid, which increases $$ [\mathrm{H^+}]  in $$solution.

Question 11

Which of the following is the correct relationship between $$ K_a $$ and $$ K_b $$ for a conjugate acid-base pair?

Accepted Answer

$$ K_a 	imes K_b = K_w $$

Question 12

A student mixes vinegar (acetic acid) and baking soda (sodium bicarbonate). Which of the following best describes the reaction?

Accepted Answer

An acid-base reaction producing carbon dioxide gas.

Question 13

Which of the following species can act as both a Brønsted-Lowry acid and a base (amphiprotic)?

Accepted Answer

$$ \mathrm{$$HCO_3$$^-} $$

Question 14

If a solution has $$ [\mathrm{OH^-}] = 1.0 	imes 10$$^{-10}$$  M at 25$$°C, what is the pH?

Accepted Answer

pH = 4

Question 15

Which of the following best describes a Lewis acid?

Accepted Answer

A substance that accepts an electron pair.

Question 16

Which of the following is the strongest acid among the choices below?

Accepted Answer

$$ \mathrm{HCl} $$

Question 17

A solution turns blue litmus paper red. Which of the following is most likely true about the solution?

Accepted Answer

It has a pH less than 7.

Question 18

Which of the following best explains why soap is slippery to the touch?

Accepted Answer

Soap contains basic compounds that react with skin oils to form slippery substances.

Question 19

Which of the following is the correct expression for the ion-product constant of water ($$ K_w $$)?

Accepted Answer

$$ K_w = [\mathrm{H^+}][\mathrm{OH^-}] $$

Question 20

Which of the following best describes the equilibrium position of an acid-base reaction?

Accepted Answer

It favors the formation of the weaker acid and the weaker base.

Acid-Base Equilibria: Definitions, Properties, and Calculations

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