CH$$_3NH$_2$$ ($$K_b = 8.3 \times 10$$^{-4}$$)

HNO$$_3$$ ($$K_a = 2.5 \times 10^1$)

Question 1

Which of the following compounds is NOT considered a common acid?

Accepted Answer

CH4

Question 2

According to the Arrhenius definition, which of the following increases the concentration of OH$$^-$$ ions when dissolved in water?

Accepted Answer

NaOH

Question 3

Which of the following is a characteristic of a strong base?

Accepted Answer

It removes H$$^+$$ ions in solution.

Question 4

Which ions are formed from the dissociation of Sr(OH)$$_2 in $$water?

Accepted Answer

Sr$$^{2+}$$ and 2 OH$$^-$$

Question 5

Which of the following is a Brønsted-Lowry acid?

Accepted Answer

HCN

Question 6

What is the conjugate base of HSO$$_4^-$$?

Accepted Answer

SO$$_4$$^{2-}$$

Question 7

Which of the following acids has a relatively strong conjugate base?

Accepted Answer

HCN

Question 8

Which of the following is the strongest base?

Accepted Answer

OH$$^-$$

Question 9

Which of the following bases will have the weakest conjugate acid?

Accepted Answer

KOH

Question 10

A solution has a pH of 6.12. What is the hydronium ion concentration $$[H^+]$$?

Accepted Answer

$$7.6 	imes 10$$^{-7}$$ M

Question 11

Which statement about aqueous solutions is true?

Accepted Answer

For a basic solution the concentration of H$$_3O$^+ is $$less than the concentration of OH$$^-. $$

Question 12

What is the relationship between the strength of an acid and the strength of its conjugate base?

Accepted Answer

A strong acid has a weak conjugate base.

Question 13

Which of the following combinations can result in the formation of a buffer?

Accepted Answer

Weak acid and its conjugate base

Question 14

If the pH of a solution is 9.00, what is the pOH?

Accepted Answer

$$5.00$$

Question 15

Which of the following Brønsted-Lowry bases has the greatest concentration of hydroxide ions?

Accepted Answer

CH$$_3NH$_2$$ ($$K_b = 8.3 	imes 10$$^{-4}$$)

Question 16

What is the equilibrium expression for the ionization of a weak acid, HA, in water?

Accepted Answer

$$K_a = \dfrac{[A^-][H_3O^+]}{[HA]}$$

Question 17

A solution is prepared by dissolving 0.235 mol Sr(OH)$$_2 in $$water to produce a solution with a volume of 750 mL. What is the $$[OH^-]$$?

Accepted Answer

$$0.313 M$$

Question 18

Which of the following acids has the weakest conjugate base?

Accepted Answer

HNO$$_3$$ ($$K_a = 2.5 	imes 10^1$)

Question 19

If the $$K_b of NH$_3 is$$ $$1.76 	imes 10$$^{-5}$$, what is the acid dissociation constant K_a$ of its conjugate acid?

Accepted Answer

$$5.68 	imes 10$$^{-10}$$

Acids and Bases: Properties, Definitions, and Calculations – GOB Chemistry Study Guide

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