Question 1

Of the following substances,an aqueous solution of ________ will form basic solutions. NH4Br Pb(NO3)2 K2CO3 NaF

Accepted Answer

A) NH4Br, Pb(NO3)2 
B) K2CO3, NH4Br 
C) NaF only 
D) NaF, K2CO3 
E) NH4Br only 
A) NH4Br, Pb(NO3)2 
B) K2CO3, NH4Br 
C) NaF only 
D) NaF, K2CO3 
E) NH4Br only

Question 2

Of the acids in the table below,________ is the strongest acid.

Accepted Answer

A) HOAc 
B) HCHO2 
C) HClO 
D) HF 
E) HOAc and HCHO2 
A) HOAc 
B) HCHO2 
C) HClO 
D) HF 
E) HOAc and HCHO2

Question 3

In which of the following aqueous solutions does the weak acid exhibit the lowest percentage ionization?

Accepted Answer

A) 0.01 M HCN (   = 6.2 ×   ) 
B) 0.01 M H2CO3 (   = 4.5 ×   ) 
C) 0.01 M HNO2 (   = 4.0 ×   ) 
D) 0.01 M HCHO2 (   = 1.8 ×   ) 
E) 0.01 M HOCl (   = 3.5 ×   ) 
A) 0.01 M HCN (   = 6.2 ×   ) 
B) 0.01 M H2CO3 (   = 4.5 ×   ) 
C) 0.01 M HNO2 (   = 4.0 ×   ) 
D) 0.01 M HCHO2 (   = 1.8 ×   ) 
E) 0.01 M HOCl (   = 3.5 ×   )

Question 4

Which solution below has the highest concentration of hydroxide ions?

Accepted Answer

A) pH = 12.5 
B) pH = 11 
C) pH = 8.3 
D) pH = 6.0 
E) pH = 3.0 
A) pH = 12.5 
B) pH = 11 
C) pH = 8.3 
D) pH = 6.0 
E) pH = 3.0

Question 5

A Br∅nsted-Lowry acid is defined as a substance that ________.

Accepted Answer

A) increases Ka when placed in H2O 
B) decreases [H+] when placed in H2O 
C) increases [OH-] when placed in H2O 
D) acts as a proton acceptor 
E) acts as a proton donor 
A) increases Ka when placed in H2O 
B) decreases [H+] when placed in H2O 
C) increases [OH-] when placed in H2O 
D) acts as a proton acceptor 
E) acts as a proton donor

Question 6

The acid-dissociation constants of phosphoric acid (H3PO4)are   = 7.5 × 10-3,   and Ka3 = 4.2 × 10-13 at 25.0 °C.What is the pH of a 2.5 M aqueous solution of phosphoric acid?

Accepted Answer

A) 1.82 
B) 0.40 
C) 2.51 
D) 0.86 
E) 0.13 
A) 1.82 
B) 0.40 
C) 2.51 
D) 0.86 
E) 0.13

Question 7

What is the pH of a sodium fluoride solution prepared by adding 0.4198 grams of sodium fluoride to 100.0 ml of water at 25.0 °C?
 The Ka at 25.0 °C for HF is 7.2 × 10-4.

Accepted Answer

Question 8

The pH of a 0.25 M aqueous solution of hydrofluoric acid,HF,at 25.0 °C is 2.03.What is the value of Ka for HF?

Accepted Answer

A) 2.0 × 10-9 
B) 1.1 × 10-9 
C) 6.0 × 10-5 
D) 3.5 × 10-4 
E) none of the above 
A) 2.0 × 10-9 
B) 1.1 × 10-9 
C) 6.0 × 10-5 
D) 3.5 × 10-4 
E) none of the above

Question 9

The acid-dissociation constant,Ka,for an unknown acid HA is 4.57 × 10-3.What is the base-dissociation constant,Kb,for the unknown anion A-?

Accepted Answer

A) 5.43 × 10-5 
B) 4.57 × 10-3 
C) 7.81 × 10-6 
D) 2.19 × 10-12 
E) 2.19 × 102 
A) 5.43 × 10-5 
B) 4.57 × 10-3 
C) 7.81 × 10-6 
D) 2.19 × 10-12 
E) 2.19 × 102

Question 10

An aqueous solution of NaF is prepared by dissolving 0.350 mol of NaF in sufficient water to yield 1.0 L of solution.The pH of the solution was 8.93 at 25.0 °C.The Kb of F- is ________.

Accepted Answer

A) 1.2 × 10-5 
B) 2.1 × 10-10 
C) 6.9 × 10-9 
D) 2.8 × 10-12 
E) 9.9 × 10-2 
A) 1.2 × 10-5 
B) 2.1 × 10-10 
C) 6.9 × 10-9 
D) 2.8 × 10-12 
E) 9.9 × 10-2

Question 11

Using the data in the table,which of the conjugate bases below is the strongest base?

Accepted Answer

A) OAc- 
B) C7H5O2- 
C) NO2- 
D)    
E) OAc- and C7H5     
A) OAc- 
B) C7H5O2- 
C) NO2- 
D)    
E) OAc- and C7H5

Question 12

What is the pOH of an aqueous solution at 25.0 °C in which   ] is 0.0050 M?

Accepted Answer

A) 8.70 
B) 11.70 
C) -11.70 
D) -8.70 
E) none of the above 
A) 8.70 
B) 11.70 
C) -11.70 
D) -8.70 
E) none of the above

Question 13

The pH of a 0.25 M aqueous solution ammonia,NH3,at 25.0 °C is 9.50.What is the value of Kb for NH3?

Accepted Answer

A) 2.5 × 10-1 
B) 4.0 × 10-19 
C) 4.0 × 10-9 
D) 3.2 × 10-5 
E) none of the above 
A) 2.5 × 10-1 
B) 4.0 × 10-19 
C) 4.0 × 10-9 
D) 3.2 × 10-5 
E) none of the above

Question 14

The pH of a 0.15 M aqueous solution of NaBrO (the sodium salt of HBrO)is 10.7.What is the Ka for HBrO?

Accepted Answer

A) 8.9 × 10-4 
B) 1.6 × 10-6 
C) 1.3 × 10-12  
D) 3.3 × 10-8 
E) 6.0 × 10-9 
A) 8.9 × 10-4 
B) 1.6 × 10-6 
C) 1.3 × 10-12  
D) 3.3 × 10-8 
E) 6.0 × 10-9

Question 15

The pH of a 0.25 M aqueous solution of HA at 25.0 °C is 4.48.What is the value of Ka for HA?

Accepted Answer

Question 16

The   for acid HA is   What is the pOH of a 0.10 M aqueous solution of KA?

Accepted Answer

A) 5.92 
B) 1.00 
C) 8.08 
D) 1.58 
E) 5.01 
A) 5.92 
B) 1.00 
C) 8.08 
D) 1.58 
E) 5.01

Question 17

An aqueous solution contains 0.10 M HNO3. The solution is ________.

Accepted Answer

A) acidic 
B) basic 
C) neutral 
D) very dilute 
E) highly colored 
A) acidic 
B) basic 
C) neutral 
D) very dilute 
E) highly colored

Question 18

Classify the following compounds as weak acids (W)or strong acids (S): hydrobromic acid hydrochloric acid hydrofluoric acid

Accepted Answer

A) W W W 
B) S S S 
C) S W W 
D) W S S 
E) S S W 
A) W W W 
B) S S S 
C) S W W 
D) W S S 
E) S S W

Question 19

What is the concentration (in M)of hydronium ions in a solution at 25.0 °C with pH = 4.146?

Accepted Answer

A) 4.15 
B) 9.85 
C) 1.40 ×   
D) 7.15 ×   
E) none of the above 
A) 4.15 
B) 9.85 
C) 1.40 ×   
D) 7.15 ×   
E) none of the above

Question 20

Classify the following compounds as weak acids (W)or strong acids (S): hydrocyanic acid hydrofluoric acid hydrobromic acid

Accepted Answer

A) S W W 
B) S S S 
C) W W S 
D) W S S 
E) W S W 
A) S W W 
B) S S S 
C) W W S 
D) W S S 
E) W S W

Exam 16: Acid-Base Equilibria

Of the following substances,an aqueous solution of ________ will form basic solutions. NH4Br Pb(NO3)2 K2CO3 NaF

Of the acids in the table below,________ is the strongest acid.

In which of the following aqueous solutions does the weak acid exhibit the lowest percentage ionization?

Which solution below has the highest concentration of hydroxide ions?

A Br∅nsted-Lowry acid is defined as a substance that ________.

The acid-dissociation constants of phosphoric acid (H3PO4)are = 7.5 × 10-3, and Ka3 = 4.2 × 10-13 at 25.0 °C.What is the pH of a 2.5 M aqueous solution of phosphoric acid?

What is the pH of a sodium fluoride solution prepared by adding 0.4198 grams of sodium fluoride to 100.0 ml of water at 25.0 °C? The Ka at 25.0 °C for HF is 7.2 × 10-4.

The pH of a 0.25 M aqueous solution of hydrofluoric acid,HF,at 25.0 °C is 2.03.What is the value of Ka for HF?

The acid-dissociation constant,Ka,for an unknown acid HA is 4.57 × 10-3.What is the base-dissociation constant,Kb,for the unknown anion A-?

An aqueous solution of NaF is prepared by dissolving 0.350 mol of NaF in sufficient water to yield 1.0 L of solution.The pH of the solution was 8.93 at 25.0 °C.The Kb of F- is ________.

Using the data in the table,which of the conjugate bases below is the strongest base?

What is the pOH of an aqueous solution at 25.0 °C in which ] is 0.0050 M?

The pH of a 0.25 M aqueous solution ammonia,NH3,at 25.0 °C is 9.50.What is the value of Kb for NH3?

The pH of a 0.15 M aqueous solution of NaBrO (the sodium salt of HBrO)is 10.7.What is the Ka for HBrO?

The pH of a 0.25 M aqueous solution of HA at 25.0 °C is 4.48.What is the value of Ka for HA?

The for acid HA is What is the pOH of a 0.10 M aqueous solution of KA?

An aqueous solution contains 0.10 M HNO3. The solution is ________.

Classify the following compounds as weak acids (W)or strong acids (S): hydrobromic acid hydrochloric acid hydrofluoric acid

What is the concentration (in M)of hydronium ions in a solution at 25.0 °C with pH = 4.146?

Classify the following compounds as weak acids (W)or strong acids (S): hydrocyanic acid hydrofluoric acid hydrobromic acid

Introduction: Matter, energy, and Measurement

Atoms, molecules, and Ions

Chemical Reactions and Reaction Stoichiometry

Reactions in Aqueous Solution

Thermochemistry

Electronic Structure of Atoms

Periodic Properties of the Elements

Basic Concepts of Chemical Bonding

Molecular Geometry and Bonding Theories

Gases

Liquids and Intermolecular Forces

Solids and Modern Materials

Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Additional Aspects of Aqueous Equilibria

Chemistry of the Environment

Chemical Thermodynamics

Electrochemistry

Nuclear Chemistry

Chemistry of the Nonmetals

Transition Metals and Coordination Chemistry

The Chemistry of Life: Organic and Biological Chemistry

Filters

Of the following substances,an aqueous solution of ________ will form basic solutions. NH₄Br Pb(NO₃)₂ K₂CO₃ NaF

The acid-dissociation constants of phosphoric acid (H₃PO₄)are = 7.5 × 10^-3, and K_a3 = 4.2 × 10^-13 at 25.0 °C.What is the pH of a 2.5 M aqueous solution of phosphoric acid?

What is the pH of a sodium fluoride solution prepared by adding 0.4198 grams of sodium fluoride to 100.0 ml of water at 25.0 °C? The K_a at 25.0 °C for HF is 7.2 × 10^-4.

The pH of a 0.25 M aqueous solution of hydrofluoric acid,HF,at 25.0 °C is 2.03.What is the value of K_a for HF?

The acid-dissociation constant,K_a,for an unknown acid HA is 4.57 × 10^-3.What is the base-dissociation constant,K_b,for the unknown anion A^-?

An aqueous solution of NaF is prepared by dissolving 0.350 mol of NaF in sufficient water to yield 1.0 L of solution.The pH of the solution was 8.93 at 25.0 °C.The K_b of F^-is ________.

The pH of a 0.25 M aqueous solution ammonia,NH₃,at 25.0 °C is 9.50.What is the value of K_b for NH₃?

The pH of a 0.15 M aqueous solution of NaBrO (the sodium salt of HBrO)is 10.7.What is the K_a for HBrO?

The pH of a 0.25 M aqueous solution of HA at 25.0 °C is 4.48.What is the value of K_a for HA?

An aqueous solution contains 0.10 M HNO₃. The solution is ________.