Question 1

If a solution is buffered at a pH of 9.5, then the addition of a small amount of acid will cause the solution to have a pH of approximately

Accepted Answer

A)  7.5 
B)  8.5 
C)  9.5 
D)  10.5 
A)  7.5 
B)  8.5 
C)  9.5 
D)  10.5

Question 2

Select from the response list for the acid that best fits the description: an acid that completely dissociates in solution to produce negative ions with a charge of one.

Accepted Answer

A)  HCl 
B)  HC2H3O2 
C)  H2C3H2O2 
D)  H2SO4 
A)  HCl 
B)  HC2H3O2 
C)  H2C3H2O2 
D)  H2SO4

Question 3

If the pH of a solution increases from 3.1 to 5.1 the hydronium ion concentration

Accepted Answer

A)  increases by a factor of 1.6 
B)  increases by a factor of 100 
C)  decreases by a factor of 1.6 
D)  decreases by a factor of 100 
A)  increases by a factor of 1.6 
B)  increases by a factor of 100 
C)  decreases by a factor of 1.6 
D)  decreases by a factor of 100

Question 4

Which of the following pairings of molar amounts and equivalents is correct?

Accepted Answer

A)  1 mole of Cl- ion = 1 equivalent Cl- ion 
B)  2 moles Ca2+ ion = 2 equivalents Ca2+ ion 
C)  1 mole PO43- ion = 3 equivalents PO43- ion 
D)  more than one correct response 
E)  no correct response 
A)  1 mole of Cl- ion = 1 equivalent Cl- ion 
B)  2 moles Ca2+ ion = 2 equivalents Ca2+ ion 
C)  1 mole PO43- ion = 3 equivalents PO43- ion 
D)  more than one correct response 
E)  no correct response

Question 5

In the reaction N3- + H2O   HN3 + OH-, the Bronsted-Lowry base is

Accepted Answer

A)  N3-. 
B)  H2O. 
C)  HN3. 
D)  OH-. 
A)  N3-. 
B)  H2O. 
C)  HN3. 
D)  OH-.

Question 6

Characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices: (1) Both members of a Bronsted-Lowry conjugate acid-base pair must contain the element hydrogen.
(2) The larger the value of the acid ionization constant for an acid, the weaker the acid is.
(3) Weak acids cannot completely neutralize strong bases.

Accepted Answer

A)  All three statements are true. 
B)  Two of the three statements are true. 
C)  Only one of the statements is true. 
D)  None of the statements is true. 
A)  All three statements are true. 
B)  Two of the three statements are true. 
C)  Only one of the statements is true. 
D)  None of the statements is true.

Question 7

Which of the following statements concerning Arrhenius acids and Arrhenius bases is incorrect?

Accepted Answer

A)  In the pure state, Arrhenius acids are covalent compounds. 
B)  In the pure state, Arrhenius bases are ionic compounds. 
C)  Dissociation is the process by which Arrhenius acids produce H+ ions in solution. 
D)  Arrhenius bases are also called hydroxide bases. 
A)  In the pure state, Arrhenius acids are covalent compounds. 
B)  In the pure state, Arrhenius bases are ionic compounds. 
C)  Dissociation is the process by which Arrhenius acids produce H+ ions in solution. 
D)  Arrhenius bases are also called hydroxide bases.

Question 8

Select from the response list the compound or ion that best fits the description: conjugate acid of HPO42-.

Accepted Answer

A)  H3PO4 
B)  H2PO4- 
C)  HPO42- 
D)  PO43- 
A)  H3PO4 
B)  H2PO4- 
C)  HPO42- 
D)  PO43-

Question 9

In which of the following pairs of salts will both members of the pair hydrolyze in water to give solutions that are basic?

Accepted Answer

A)  LiCl and NaCN 
B)  NH4Cl and NH4NO3 
C)  NaC2H3O2 and NaF 
D)  KNO3 and Li2SO4 
A)  LiCl and NaCN 
B)  NH4Cl and NH4NO3 
C)  NaC2H3O2 and NaF 
D)  KNO3 and Li2SO4

Question 10

Determining the concentration of an acid using an acid-base titration always involves completely reacting a measured volume of the acid with a known volume of

Accepted Answer

A)  base of known concentration 
B)  1.0 M base 
C)  indicator of known concentration 
D)  1.0 M indicator 
A)  base of known concentration 
B)  1.0 M base 
C)  indicator of known concentration 
D)  1.0 M indicator

Question 11

In which of the following pairs of acids are both members of the pair polyprotic?

Accepted Answer

A)  H2SO4 and HC2H3O2 
B)  HNO3 and H2C4H4O6 
C)  HC2H3O2 and H3C6H5O7 
D)  H3PO4 and H2C4H4O7 
A)  H2SO4 and HC2H3O2 
B)  HNO3 and H2C4H4O6 
C)  HC2H3O2 and H3C6H5O7 
D)  H3PO4 and H2C4H4O7

Question 12

Select from the response list the compound or ion that best fits the description: reacts with H3O+ to form HPO42-.

Accepted Answer

A)  H3PO4 
B)  H2PO4- 
C)  HPO42- 
D)  PO43- 
A)  H3PO4 
B)  H2PO4- 
C)  HPO42- 
D)  PO43-

Question 13

Characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices: (1) The result of salt hydrolysis in aqueous solution is always a basic solution.
(2) Arrhenius acids are ionic compounds and Bronsted-Lowry acids are covalent compounds.
(3) Each successive step in the dissociation of a polyprotic acid occurs to a greater extent than the previous step.

Accepted Answer

A)  All three statements are true. 
B)  Two of the three statements are true. 
C)  Only one of the statements is true. 
D)  None of the statements is true. 
A)  All three statements are true. 
B)  Two of the three statements are true. 
C)  Only one of the statements is true. 
D)  None of the statements is true.

Question 14

Characterize the following solution using the response list: aqueous NaOH solution.

Accepted Answer

A)  an acidic solution 
B)  a basic solution 
C)  a neutral solution 
D)  a buffer solution 
A)  an acidic solution 
B)  a basic solution 
C)  a neutral solution 
D)  a buffer solution

Question 15

A solution with a pH of 13.3 is

Accepted Answer

A)  strongly acidic 
B)  weakly acidic 
C)  weakly basic 
D)  strongly basic 
A)  strongly acidic 
B)  weakly acidic 
C)  weakly basic 
D)  strongly basic

Question 16

The pH of a buffered solution

Accepted Answer

A)  always equals 7.0 
B)  may be acidic or basic depending on the buffer present 
C)  changes drastically when a small amount of acid is added 
D)  more than one correct response 
E)  no correct response 
A)  always equals 7.0 
B)  may be acidic or basic depending on the buffer present 
C)  changes drastically when a small amount of acid is added 
D)  more than one correct response 
E)  no correct response

Question 17

In the neutralization reaction between 0.6 M Ba(OH)2 and 0.6 M HNO3, the base and acid will react in a molar ratio of

Accepted Answer

A)  one to one 
B)  one to two 
C)  two to one 
D)  two to two 
A)  one to one 
B)  one to two 
C)  two to one 
D)  two to two

Question 18

The H2PO4- ion has both a conjugate acid and a conjugate base. It is true that

Accepted Answer

A)  H3PO4 is the conjugate acid. 
B)  HPO42- is the conjugate base. 
C)  H2PO3- is the conjugate base. 
D)  More than one correct response. 
E)  No correct response. 
A)  H3PO4 is the conjugate acid. 
B)  HPO42- is the conjugate base. 
C)  H2PO3- is the conjugate base. 
D)  More than one correct response. 
E)  No correct response.

Question 19

Select from the response list the compound or ion that best fits the description: will form a buffer with PO43-.

Accepted Answer

A)  H3PO4 
B)  H2PO4- 
C)  HPO42- 
D)  PO43- 
A)  H3PO4 
B)  H2PO4- 
C)  HPO42- 
D)  PO43-

Question 20

Characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices: (1) In aqueous solution, Arrhenius acids undergo ionization and Arrhenius bases undergo dissociation.
(2) Production of the salt NaNO3 through a neutralization reaction involves the reaction of a weak acid with a strong base.
(3) The ion product constant for water, at 24oC, has the numerical value 1.0 x 10-14.

Accepted Answer

A)  All three statements are true. 
B)  Two of the three statements are true. 
C)  Only one of the statements is true. 
D)  None of the statements is true. 
A)  All three statements are true. 
B)  Two of the three statements are true. 
C)  Only one of the statements is true. 
D)  None of the statements is true.

Exam 10: Acids, Bases, and Salts

If a solution is buffered at a pH of 9.5, then the addition of a small amount of acid will cause the solution to have a pH of approximately

Select from the response list for the acid that best fits the description: an acid that completely dissociates in solution to produce negative ions with a charge of one.

If the pH of a solution increases from 3.1 to 5.1 the hydronium ion concentration

Which of the following pairings of molar amounts and equivalents is correct?

In the reaction N3- + H2O HN3 + OH-, the Bronsted-Lowry base is

Which of the following statements concerning Arrhenius acids and Arrhenius bases is incorrect?

Select from the response list the compound or ion that best fits the description: conjugate acid of HPO42-.

In which of the following pairs of salts will both members of the pair hydrolyze in water to give solutions that are basic?

Determining the concentration of an acid using an acid-base titration always involves completely reacting a measured volume of the acid with a known volume of

In which of the following pairs of acids are both members of the pair polyprotic?

Select from the response list the compound or ion that best fits the description: reacts with H3O+ to form HPO42-.

Characterize the following solution using the response list: aqueous NaOH solution.

A solution with a pH of 13.3 is

The pH of a buffered solution

In the neutralization reaction between 0.6 M Ba(OH)2 and 0.6 M HNO3, the base and acid will react in a molar ratio of

The H2PO4- ion has both a conjugate acid and a conjugate base. It is true that

Select from the response list the compound or ion that best fits the description: will form a buffer with PO43-.

Basic Concepts About Matter

Measurements in Chemistry

Atomic Structure and the Periodic Table

Chemical Bonding: the Ionic Bond Model

Chemical Bonding: the Covalent Bond Model

Chemical Calculations: Formula Masses, Moles, and Chemical Equations

Gases, Liquids, and Solids

Solutions

Chemical Reactions

Nuclear Chemistry

Saturated Hydrocarbons

Unsaturated Hydrocarbons

Alcohols, Phenols, and Ethers

Aldehydes and Ketones

Carboxylic Acids, Esters, and Other Acid Derivatives

Amines and Amides

Carbohydrates

Lipids

Proteins

Enzymes and Vitamins

Nucleic Acids

Biochemical Energy Production

Carbohydrate Metabolism

Lipid Metabolism

Protein Metabolism

Filters

In the reaction N₃^- + H₂O HN₃ + OH^-, the Bronsted-Lowry base is

Select from the response list the compound or ion that best fits the description: conjugate acid of HPO₄²^-.

Select from the response list the compound or ion that best fits the description: reacts with H₃O⁺ to form HPO₄²^-.

In the neutralization reaction between 0.6 M Ba(OH)₂ and 0.6 M HNO₃, the base and acid will react in a molar ratio of

The H₂PO₄^- ion has both a conjugate acid and a conjugate base. It is true that

Select from the response list the compound or ion that best fits the description: will form a buffer with PO₄³^-.