Deck 12: Acids Bases

Question 1

An aqueous solution is found to have an H⁺ concentration of 2.0 × 10^-4 M.What is the concentration of OH^- in this solution?

A) 5.0 × 10^-11 M
B) 2.0 × 10^-18 M
C) 2.0 × 10¹⁰ M
D) 4.0 M

Answer 1

5.0 × 10^-11 M

Question 2

In the following equilibrium,which species is the CONJUGATE BASE of compound b?

A) a
B) b
C) c
D) d

Answer 2

d

Question 3

A compound that increases the concentration of hydroxide ion in an aqueous solution is a(n):

A) acid.
B) base.
C) salt.
D) solvent.

Answer 3

base.

Question 4

The pH of an unknown solution is 8.5.Its [OH^-] is:

A) 3.2 × 10^-6 M.
B) 3.2 × 10^-9 M.
C) 3.2 × 10⁵ M.
D) 3.2 M.

Question 5

What is the pH of a solution if [H⁺] = 1.0 × 10^-9 M?

A) 6.0
B) 9.0
C) 8.6
D) 5.4

Question 6

In the following equilibrium,which species is the CONJUGATE BASE of compound a?

A) a
B) b
C) c
D) d

Question 7

The net ionic equation for the reaction Zn (s)+ 2 HNO₃ (aq) $\rightarrow$ H₂(g)+ Zn(NO₃)₂ (aq)is:

A) Zn (s)+ H⁺ (aq) $\rightarrow$ H₂(g)+ Zn²⁺ (aq).
B) Zn (s)+ 2 H⁺ (aq) $\rightarrow$ H₂(g)+ Zn²⁺ (aq).
C) Zn (s)+ 2 H⁺ (aq) $\rightarrow$ H₂(g)+ Zn⁺ (aq).
D) Zn (s)+ H⁺ (aq) $\rightarrow$ H₂(g)+ Zn⁺ (aq).

Question 8

Predict the products for HCl (aq)+ NaOH (aq) $\rightarrow$

A) NaCl (aq)+ H₂O (l)
B) NaCl (aq)+ NaOH (aq)
C) NaCl (aq)+ HCl (aq)
D) NaCl (aq)+ H₂ (g)

Question 9

An aqueous solution is found to have an H⁺ concentration of 7.8 × 10^-2 M.What is the concentration of OH^- in this solution?

A) 1.3 × 10^-13 M
B) 7.8 × 10¹² M
C) 2.0 × 10¹⁰ M
D) 7.8 M

Question 10

Which acid can undergo up to a second ionization?

A) H₂SO₄ (aq)
B) HNO₃ (aq)
C) HNO₂ (aq)
D) HCl (aq)

Question 11

Identify the Brønsted base in this reaction. H₂O (l)+ HNO₃ (aq) $\rightarrow$ H₃O⁺ (aq)+ NO₃^- (aq)

A) H₂O (l)
B) HNO₃ (aq)
C) H₃O⁺ (aq)
D) NO₃^- (aq)

Question 12

Acids that completely ionize in water are:

A) strong bases.
B) weak bases.
C) strong acids.
D) weak acids.

Question 13

The neutralization reaction of barium hydroxide with aqueous hydrochloric acid (HCl)leads to what two products?

A) H₂O and BaCl
B) Ba(ClO₂)₂ and H₂
C) HCl and BaOCl
D) BaCl₂ and H₂O

Question 14

Identify the Brønsted acid in this reaction. H₂SO₄ (aq)+ HNO₃ (aq) $\rightarrow$ HSO₄^- (aq)+ H₂NO₃⁺ (aq)

A) H₂SO₄ (aq)
B) HNO₃ (aq)
C) HSO₄^- (aq)
D) H₂NO₃⁺ (aq)

Question 15

Acids that partially ionize in water are:

A) strong bases.
B) weak bases.
C) strong acids.
D) weak acids.

Question 16

The pH of an unknown solution is 2.1.Its [OH^-] is:

A) 0.0079 M.
B) 1.3 × 10^-12 M.
C) 3.2 × 10² M.
D) 3.2 M.

Question 17

Acid and base combine to form:

A) salt and water.
B) gas and water.
C) salt and gas.
D) only ionic compounds.

Question 18

Which acid will fully ionize in water?

A) HClO
B) HF
C) HCl
D) HC₂Cl₃O₂

Question 19

A compound that is a proton (H⁺)donor is a(n):

A) salt.
B) solvent.
C) base.
D) acid.

Question 20

The net ionic equation for the reaction Cu (s)+ 2 HNO₃ (aq) $\rightarrow$ H₂(g)+ Cu(NO₃)₂ (aq)is:

A) Cu (s)+ H⁺ (aq) $\rightarrow$ H₂(g)+ Cu²⁺ (aq).
B) Cu (s)+ 2 H⁺ (aq) $\rightarrow$ H₂(g)+ Cu²⁺ (aq).
C) Cu (s)+ 2 H⁺ (aq) $\rightarrow$ H₂(g)+ Cu⁺ (aq).
D) Cu (s)+ H⁺ (aq) $\rightarrow$ H₂(g)+ Cu⁺ (aq).

Question 21

Which statement is FALSE?

A) Buffer systems keep pH within a narrow range.
B) A buffer is a solution containing a mixture of acidic and basic components that resist changes in pH.
C) An appropriate buffer is a mixture of a strong acid and its conjugate base.
D) An appropriate buffer is a mixture of a weak acid and its conjugate base.

Question 22

Which combination would make a buffer solution?

A) 0.1 M HCl and 0.1 M NaCl
B) 0.1 M H₂CO₃ and 0.1 M NaHCO₃
C) 0.4 M HNO₃ and 0.4 M NaNO₃
D) 0.15 M H₂SO₄ and 0.4 M CaSO₄

Question 23

A 50.0-mL sample of HNO₃ is neutralized by reaction with 120.0 mL of 2.50 M NaOH.What is the concentration of HNO₃ in the unknown sample?

A) 6.00 M
B) 1.04 M
C) 0.960 M
D) 1.55 M

Question 24

A buffer solution contains a mixture of carbonic acid (H₂CO₃)and potassium hydrogen carbonate (KHCO₃).What reaction will take place if H⁺ is added to this solution?

A) H₂CO₃ (aq)+ H⁺ (aq) $\rightarrow$ H₃CO₃⁺ (aq)
B) HCO₃^- (aq)+ H⁺ (aq) $\rightarrow$ H₂CO₃ (aq)
C) KHCO₃ (aq)+ H⁺ (aq) $\rightarrow$ KH₂CO₃ (aq)
D) CO₃^2- (aq)+ H⁺ (aq) $\rightarrow$ HC₂H₃O₂ (aq)

Question 25

A 25.0-mL sample of HBr is neutralized by reaction with 20.0 mL of 3.00 M KOH.What is the concentration of HBr in the unknown sample?

A) 3.8 M
B) 2.4 M
C) 1.7 M
D) 0.55 M

Question 26

A buffer solution contains a mixture of acetic acid (HC₂H₃O₂)and potassium acetate (KC₂H₃O₂).What reaction will take place if H⁺ is added to this solution?

A) HC₂H₃O₂ (aq)+ H⁺ (aq) $\rightarrow$ H₂C₂H₃O₂⁺ (aq)
B) C₂H₃O₂^- (aq)+ H⁺ (aq) $\rightarrow$ H₂C₂H₃O₂⁺ (aq)
C) KC₂H₃O₂ (aq)+ H⁺ (aq) $\rightarrow$ KHC₂H₃O₂ (aq)
D) C₂H₃O₂^- (aq)+ H⁺ (aq) $\rightarrow$ HC₂H₃O₂ (aq)

Question 27

Which solution will turn litmus paper blue?

A) 0.5 M NaOH
B) 2.1 M HCl
C) 4.5 M HC₂H₃O₂
D) 0.125 M HBr

Question 28

Which combination would make the MOST effective buffer solution?

A) 0.1 M H₂CO₃ and 1.0 M NaHCO₃
B) 0.1 M H₂CO₃ and 0.1 M NaHCO₃
C) 0.1 M H₂CO₃ and 2.0 M NaHCO₃
D) 0.15 M H₂CO₃ and 0.015 M NaHCO₃

Question 29

A 50.0-mL sample of H₂SO₄ is neutralized with NaOH solution having a concentration of 2.00 M.If 35.5 mL of NaOH are required to complete the neutralization,what is the concentration of the sulfuric acid solution?

A) 0.710 M
B) 2.84 M
C) 1.41 M
D) 0.355 M

Question 30

Which solution will turn litmus paper red?

A) 0.5 M KOH
B) 2.1 M Mg(OH)₂
C) 4.5 M HC₂H₃O₂
D) 0.125 M KNO₃