$$[H_3O^+] = 3.2 \times 10$$^{-9}$$ M

$$[H_3O^+] = 1.0 \times 10$$^{-5}$$ M

Question 1

Which of the following statements best describes a Brønsted–Lowry acid?

Accepted Answer

A substance that donates a proton ($$H^+)$$

Question 2

What is the correct name for the acid formed when the anion is sulfate ($$SO_4$$^{2-}$$)?

Accepted Answer

Sulfuric acid

Question 3

Which of the following is an example of a diprotic acid?

Accepted Answer

H_2SO_4

Question 4

A Brønsted–Lowry base must contain:

Accepted Answer

A lone pair of electrons

Question 5

Which of the following pairs represents a conjugate acid–base pair?

Accepted Answer

H_2O and H_3O$$^+$$

Question 6

If a species gains a proton ($$H^+$$), what happens to its charge?

Accepted Answer

It gains a $$+1$$ charge

Question 7

Which compound is amphoteric, able to act as both an acid and a base?

Accepted Answer

H_2O

Question 8

Which of the following acids is considered strong and completely dissociates in water?

Accepted Answer

HCl

Question 9

What is the correct expression for the ion-product constant for water ($$K_w$$)?

Accepted Answer

$$K_w = [H_3O^+][OH^-]$$

Question 10

A solution has $$[H_3O^+] = 1.0 	imes 10$$^{-5}$$ M. What is its pH?

Accepted Answer

pH = 5.00

Question 11

If the pH of a solution is 8.50, what is the $$[H_3O^+]$$?

Accepted Answer

$$[H_3O^+] = 3.2 	imes 10$$^{-9}$$ M

Question 12

Which salt will form a basic solution when dissolved in water?

Accepted Answer

$$NaHCO_3$$

Question 13

During a titration, the endpoint is reached when:

Accepted Answer

The number of moles of acid equals the number of moles of base

Question 14

Which of the following solutions acts as a buffer?

Accepted Answer

CH_3COOH and NaCH_3COO

Question 15

What is the effect of adding a strong acid to a buffer solution?

Accepted Answer

The pH decreases slightly

Question 16

Which equation represents the neutralization reaction between HCl and NaOH?

Accepted Answer

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

Question 17

Which of the following best explains why blood pH remains stable despite metabolic production of CO$$_2$$?

Accepted Answer

Blood contains a buffer system of carbonic acid and bicarbonate

Question 18

If a solution has $$[OH^-] = 1.0 	imes 10$$^{-9}$$ M at 25°C, what is $$[H_3O^+]$$?

Accepted Answer

$$[H_3O^+] = 1.0 	imes 10$$^{-5}$$ M

Question 19

Which of the following is true about the relationship between acid strength and conjugate base strength?

Accepted Answer

A strong acid forms a weak conjugate base

Acids and Bases: Properties, Reactions, and Applications 9

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