Question 1

What is the pH of a solution in which [H3O+] = 3.8 × 10-8 M?

Accepted Answer

A) 7.42 
B) 6.58 
C) 3.80 
D) 1.0 × 10-8 
E) 2.6 × 10-7 
A) 7.42 
B) 6.58 
C) 3.80 
D) 1.0 × 10-8 
E) 2.6 × 10-7

Question 2

If the [H3O+] of a water sample is 1 × 10-4 M,the pH of the sample is ________,and the sample is ________.

Accepted Answer

A) -4; acidic 
B) 4; acidic 
C) 4; basic 
D) 10; basic 
E) -10; basic 
A) -4; acidic 
B) 4; acidic 
C) 4; basic 
D) 10; basic 
E) -10; basic

Question 3

Which of the following statements is correct?

Accepted Answer

A) In an acidic solution,[H3O+] -7; [OH-] -7. 
B) In an acidic solution,[H3O+] > 10-7; [OH-] > 10-7. 
C) In an acidic solution,[H3O+] > 10-7; [OH-] -7. 
D) In an acidic solution,[H3O+] -7; [OH-] > 10-7. 
E) In an acidic solution,[H3O+] > 10-7; [OH-] = 10-7. 
A) In an acidic solution,[H3O+] -7; [OH-] -7. 
B) In an acidic solution,[H3O+] > 10-7; [OH-] > 10-7. 
C) In an acidic solution,[H3O+] > 10-7; [OH-] -7. 
D) In an acidic solution,[H3O+] -7; [OH-] > 10-7. 
E) In an acidic solution,[H3O+] > 10-7; [OH-] = 10-7.

Question 4

How many mL of 0.241 M H2SO4 will be needed to neutralize a 50.0 mL sample of 0.191 M KOH?

Accepted Answer

A) 19.8 mL 
B) 31.5 mL 
C) 39.6 mL 
D) 79.3 mL 
E) 126 mL 
A) 19.8 mL 
B) 31.5 mL 
C) 39.6 mL 
D) 79.3 mL 
E) 126 mL

Question 5

If the concentration of OH- in an aqueous solution is 1.4 × 10-7 M,the concentration of H3O+ is ________.

Accepted Answer

A) 7.1 × 10+6 M 
B) 1.0 × 10-7 M 
C) 1.4 × 10-7 M 
D) 7.1 × 10-8 M 
E) 1.3 × 10-8 M 
A) 7.1 × 10+6 M 
B) 1.0 × 10-7 M 
C) 1.4 × 10-7 M 
D) 7.1 × 10-8 M 
E) 1.3 × 10-8 M

Question 6

Which of the following statements is correct?

Accepted Answer

A) In a basic solution,[H3O+] -7; [OH-] -7. 
B) In a basic solution,[H3O+] > 10-7; [OH-] > 10-7. 
C) In a basic solution,[H3O+] > 10-7; [OH-] -7. 
D) In a basic solution,[H3O+] -7; [OH-] > 10-7. 
E) In a basic solution,[H3O+] > 10-7; [OH-] = 10-7. 
A) In a basic solution,[H3O+] -7; [OH-] -7. 
B) In a basic solution,[H3O+] > 10-7; [OH-] > 10-7. 
C) In a basic solution,[H3O+] > 10-7; [OH-] -7. 
D) In a basic solution,[H3O+] -7; [OH-] > 10-7. 
E) In a basic solution,[H3O+] > 10-7; [OH-] = 10-7.

Question 7

Which reaction best illustrates the behavior of the weak base H2PO4- in aqueous solution?

Accepted Answer

A) H2PO4- (aq)+ H2O (l)
 
HPO42- (aq)+ H3O+ (aq) 
B) H2PO4- (aq)+ H2O (l)
 
H3PO4 (aq)+ OH- (aq) 
C) H2PO4- (aq)
 
2H+ (aq)+ PO43- (aq) 
D) H2PO4- (aq)
 
H+ (aq)+ HPO42- (aq) 
E) H2PO4- (aq)+ H+ (aq)
 
H3PO4 (aq) 
A) H2PO4- (aq)+ H2O (l)
 
HPO42- (aq)+ H3O+ (aq) 
B) H2PO4- (aq)+ H2O (l)
 
H3PO4 (aq)+ OH- (aq) 
C) H2PO4- (aq)
 
2H+ (aq)+ PO43- (aq) 
D) H2PO4- (aq)
 
H+ (aq)+ HPO42- (aq) 
E) H2PO4- (aq)+ H+ (aq)
 
H3PO4 (aq)

Question 8

The pH of a solution with [H3O+] = 5.9 × 10-3 M,to the correct number of significant figures,is ________.

Accepted Answer

A) 5.9 × 10-3 
B) 2.2 
C) 2.23 
D) 1.01 
E) 2.229 
A) 5.9 × 10-3 
B) 2.2 
C) 2.23 
D) 1.01 
E) 2.229

Question 9

When acids and bases react the product other than water is a

Accepted Answer

A) hydrogen ion. 
B) hydroxide ion. 
C) hydronium ion. 
D) metal. 
E) salt. 
A) hydrogen ion. 
B) hydroxide ion. 
C) hydronium ion. 
D) metal. 
E) salt.

Question 10

What is the conjugate acid of HSO4-?

Accepted Answer

A) SO42- 
B) H2SO4 
C) H3O+ 
D) OH- 
E) H2SO3 
A) SO42- 
B) H2SO4 
C) H3O+ 
D) OH- 
E) H2SO3

Question 11

C5H5N + H2CO3  
C5H6 N+ + HCO3-
In the reaction shown,the conjugate acid of C5H5N is ________.

Accepted Answer

A) C5H5N 
B) H2CO3 
C) C5H6N+ 
D) HCO3- 
E) H3O+ 
A) C5H5N 
B) H2CO3 
C) C5H6N+ 
D) HCO3- 
E) H3O+

Question 12

Match the following.
-conjugate acid

Accepted Answer

A) an acid-base theory that bases reactions on hydrogen and hydroxide ions 
B) the species that results when a base accepts a proton 
C) a substance which can behave as either an acid or a base 
D) the species that results when an acid donates a proton 
E) a theory that treats acid-base reactions as proton-transfer reactions 
A) an acid-base theory that bases reactions on hydrogen and hydroxide ions 
B) the species that results when a base accepts a proton 
C) a substance which can behave as either an acid or a base 
D) the species that results when an acid donates a proton 
E) a theory that treats acid-base reactions as proton-transfer reactions

Question 13

The pH of a cup of coffee is measured as 5.45.Express this measurement as [H+],using the correct number of significant figures.

Accepted Answer

A) 3.548 × 10-6 M 
B) 3.55 × 10-6 M 
C) 3.5 × 10-6 M 
D) 4 × 10-6 M 
E) 2.82 × 105 M 
A) 3.548 × 10-6 M 
B) 3.55 × 10-6 M 
C) 3.5 × 10-6 M 
D) 4 × 10-6 M 
E) 2.82 × 105 M

Question 14

Match the following.
-Arrhenius theory

Accepted Answer

A) an acid-base theory that bases reactions on hydrogen and hydroxide ions 
B) the species that results when a base accepts a proton 
C) a substance which can behave as either an acid or a base 
D) the species that results when an acid donates a proton 
E) a theory that treats acid-base reactions as proton-transfer reactions 
A) an acid-base theory that bases reactions on hydrogen and hydroxide ions 
B) the species that results when a base accepts a proton 
C) a substance which can behave as either an acid or a base 
D) the species that results when an acid donates a proton 
E) a theory that treats acid-base reactions as proton-transfer reactions

Question 15

Hydrogen cyanide,HCN,is a weak acid.Which equation best represents its aqueous chemistry?

Accepted Answer

A) HCN (aq)+ H2O (l)
 
CN- (aq)+ H3O+ (aq) 
B) HCN (aq)+ H2O (l)
 
H2CN+ (aq)+ OH- (aq) 
C) HCN (aq)
 
H+ (aq)+ CN- (aq) 
D) HCN (aq)
 
H- (aq)+ CN+ (aq) 
E) H2O (l)
 
H+ (aq)+ OH- (aq) 
A) HCN (aq)+ H2O (l)
 
CN- (aq)+ H3O+ (aq) 
B) HCN (aq)+ H2O (l)
 
H2CN+ (aq)+ OH- (aq) 
C) HCN (aq)
 
H+ (aq)+ CN- (aq) 
D) HCN (aq)
 
H- (aq)+ CN+ (aq) 
E) H2O (l)
 
H+ (aq)+ OH- (aq)

Question 16

If the concentration of OH- is 1 × 10-2 M,the concentration of H3O+ is ________ M.

Accepted Answer

A) 1 × 100 
B) 1 × 10-2 
C) 1 × 10-7 
D) 1 × 10-12 
E) 1 × 10-14 
A) 1 × 100 
B) 1 × 10-2 
C) 1 × 10-7 
D) 1 × 10-12 
E) 1 × 10-14

Question 17

Which of the following is a weak acid?

Accepted Answer

A) HNO3 
B) H3PO4 
C) NH3 
D) HCl 
E) OH- 
A) HNO3 
B) H3PO4 
C) NH3 
D) HCl 
E) OH-

Question 18

Which solution is basic?

Accepted Answer

A) [H3O+] = 1.0 × 10-4 
B) [H3O+] = 1.0 × 10-7 
C) [H3O+] = 1.0 × 10-10 
D) [OH-] = 1.0 × 10-7 
E) [OH-] = 1.0 × 10-10 
A) [H3O+] = 1.0 × 10-4 
B) [H3O+] = 1.0 × 10-7 
C) [H3O+] = 1.0 × 10-10 
D) [OH-] = 1.0 × 10-7 
E) [OH-] = 1.0 × 10-10

Question 19

A buffer solution

Accepted Answer

A) is a salt solution. 
B) maintains pH at 7.00. 
C) is a strong base. 
D) neutralizes only acids. 
E) closely maintains its original pH. 
A) is a salt solution. 
B) maintains pH at 7.00. 
C) is a strong base. 
D) neutralizes only acids. 
E) closely maintains its original pH.

Question 20

What is the normality of a solution prepared by dissolving 75.0 g citric acid,a triprotic acid with molar mass of 192.14 g,in water to make 250.mL solution?

Accepted Answer

A) 0.173 N 
B) 0.0576 N 
C) 0.293 N 
D) 4.68 N 
E) 1.56 N 
A) 0.173 N 
B) 0.0576 N 
C) 0.293 N 
D) 4.68 N 
E) 1.56 N

Exam 10: Acids and Bases

What is the pH of a solution in which [H3O+] = 3.8 × 10-8 M?

If the [H3O+] of a water sample is 1 × 10-4 M,the pH of the sample is ________,and the sample is ________.

Which of the following statements is correct?

How many mL of 0.241 M H2SO4 will be needed to neutralize a 50.0 mL sample of 0.191 M KOH?

If the concentration of OH- in an aqueous solution is 1.4 × 10-7 M,the concentration of H3O+ is ________.

Which of the following statements is correct?

Which reaction best illustrates the behavior of the weak base H2PO4- in aqueous solution?

The pH of a solution with [H3O+] = 5.9 × 10-3 M,to the correct number of significant figures,is ________.

When acids and bases react the product other than water is a

What is the conjugate acid of HSO4-?

C5H5N + H2CO3 C5H6 N+ + HCO3- In the reaction shown,the conjugate acid of C5H5N is ________.

Match the following. -conjugate acid

The pH of a cup of coffee is measured as 5.45.Express this measurement as [H+],using the correct number of significant figures.

Match the following. -Arrhenius theory

Hydrogen cyanide,HCN,is a weak acid.Which equation best represents its aqueous chemistry?

If the concentration of OH- is 1 × 10-2 M,the concentration of H3O+ is ________ M.

Which of the following is a weak acid?

Which solution is basic?

A buffer solution

What is the normality of a solution prepared by dissolving 75.0 g citric acid,a triprotic acid with molar mass of 192.14 g,in water to make 250.mL solution?

Matter and Measurements

Atoms and the Periodic Table

Ionic Compounds

Molecular Compounds

Classification and Balancing of Chemical Reactions

Chemical Reactions: Mole and Mass Relationships

Chemical Reactions: Energy, rates, and Equilibrium

Gases, liquids, and Solids

Solutions

Nuclear Chemistry

Introduction to Organic Chemistry: Alkanes

Alkenes, alkynes, and Aromatic Compounds

Some Compounds With Oxygen, sulfur, or a Halogen

Amines

Aldehydes and Ketones

Carboxylic Acids and Their Derivatives

Amino Acids and Proteins

Enzymes and Vitamins

The Generation of Biochemical Energy

Carbohydrates

Carbohydrate Metabolism

Lipids

Lipid Metabolism

Nucleic Acids and Protein Synthesis

Genomics

Protein and Amino Acid Metabolism

Chemical Messengers: Hormones, neurotransmitters, and Drugs

Body Fluids

Filters

What is the pH of a solution in which [H₃O⁺] = 3.8 × 10^-8 M?

If the [H₃O⁺] of a water sample is 1 × 10^-4 M,the pH of the sample is ,and the sample is .

How many mL of 0.241 M H₂SO₄ will be needed to neutralize a 50.0 mL sample of 0.191 M KOH?

If the concentration of OH^- in an aqueous solution is 1.4 × 10^-7 M,the concentration of H₃O⁺ is ________.

Which reaction best illustrates the behavior of the weak base H₂PO₄^- in aqueous solution?

The pH of a solution with [H₃O⁺] = 5.9 × 10^-3 M,to the correct number of significant figures,is ________.

What is the conjugate acid of HSO₄^-?

C₅H₅N + H₂CO₃ C₅H₆ N⁺ + HCO₃^- In the reaction shown,the conjugate acid of C₅H₅N is ________.

The pH of a cup of coffee is measured as 5.45.Express this measurement as [H⁺],using the correct number of significant figures.

If the concentration of OH^- is 1 × 10^-2 M,the concentration of H₃O⁺ is ________ M.