Question 1

What is the pH of a solution prepared by mixing 100.00 mL of 0.20 M HCl with 150.00 mL of 0.10 M HCl? Assume that the volumes are additive.

Accepted Answer

A) 0)17 
B) 0)52 
C) 0)85 
D) 1)70 
A) 0)17 
B) 0)52 
C) 0)85 
D) 1)70

Question 2

Which Br∅nsted-Lowry base has the strongest conjugate acid?

Accepted Answer

A) CH3CO2- 
B) CN- 
C) F- 
D) NO3- 
A) CH3CO2- 
B) CN- 
C) F- 
D) NO3-

Question 3

What is the hydronium ion concentration and the pH for an aqueous solution of NH3 that has a hydroxide ion concentration of 2.25 × 10-3 M?

Accepted Answer

A) 4)44 × 10-11 M,3.65 
B) 4)44 × 10-11 M,10.35 
C) 4)44 × 10-12 M,2.65 
D) 4)44 × 10-12 M,11.35 
A) 4)44 × 10-11 M,3.65 
B) 4)44 × 10-11 M,10.35 
C) 4)44 × 10-12 M,2.65 
D) 4)44 × 10-12 M,11.35

Question 4

The equilibrium constant for the reaction below has the value Ka = 3.5 × 10-4.In this reaction the stronger Br∅nsted-Lowry acid is ________ and the weaker Br∅nsted-Lowry acid is ________.
HF(aq)+ H2O(l)⇌ H3O+(aq)+ F-(aq)

Accepted Answer

Question 5

If the ionization constant of water,Kw,at 40°C is 2.92 × 10-14,then what is the hydronium ion concentration for a neutral solution?

Accepted Answer

A) [H3O+] -7 M 
B) [H3O+] > 1.71 × 10-7 M 
C) [H3O+] = 1.71 × 10-7 M 
D) [H3O+] -7 M 
A) [H3O+] -7 M 
B) [H3O+] > 1.71 × 10-7 M 
C) [H3O+] = 1.71 × 10-7 M 
D) [H3O+] -7 M

Question 6

Determine the acid dissociation constant for a 0.020 M formic acid solution that has a pH of 2.74.Formic acid is a weak monoprotic acid and the equilibrium equation of interest is
HCOOH(aq)+ H2O(l)⇌ H3O+(aq)+ HCO2-(aq).

Accepted Answer

A) 1)8 × 10-3 
B) 1)8 × 10-4 
C) 3)6 × 10-4 
D) 3)6 × 10-5 
A) 1)8 × 10-3 
B) 1)8 × 10-4 
C) 3)6 × 10-4 
D) 3)6 × 10-5

Question 7

Aniline, (C6H5NH2,Kb = 4.3 × 10-10 at 25°C)is an industrially important amine used in the making of dyes.Determine the pH of an aniline solution made by dissolving 3.90 g of aniline in enough water to make 100 mL of solution.

Accepted Answer

A) 4)87 
B) 9)13 
C) 9)74 
D) 10.74 
A) 4)87 
B) 9)13 
C) 9)74 
D) 10.74

Question 8

What is the strongest Br∅nsted-Lowry acid in the chemical reaction shown below?
2 HNO3(aq)+ Ba(OH)2(aq)→ Ba(NO3)2(aq)+ 2 H2O(l)

Accepted Answer

A) HNO3 
B) Ba(OH)2 
C) Ba(NO3)2 
D) H2O 
A) HNO3 
B) Ba(OH)2 
C) Ba(NO3)2 
D) H2O

Question 9

Which one of the following salts,when dissolved in water,produces the solution with the lowest pH?

Accepted Answer

A) NaCl 
B) KCl 
C) MgCl2 
D) AlCl3 
A) NaCl 
B) KCl 
C) MgCl2 
D) AlCl3

Question 10

An Arrhenius base is best defined as a

Accepted Answer

A) proton donor. 
B) hydroxide acceptor. 
C) substance that dissociates in water to produce aqueous hydrogen ions. 
D) substance that dissociates in water to produce aqueous hydroxide ions. 
A) proton donor. 
B) hydroxide acceptor. 
C) substance that dissociates in water to produce aqueous hydrogen ions. 
D) substance that dissociates in water to produce aqueous hydroxide ions.

Question 11

What is the strongest acid among the following?

Accepted Answer

A) H2O 
B) H2S 
C) H2Se 
D) H2Te 
A) H2O 
B) H2S 
C) H2Se 
D) H2Te

Question 12

The following pictures represent equal volumes of aqueous solutions of three acids HA (A = X,Y,or Z);water molecules have been omitted for clarity.  
-Arrange the acids in order of increasing acid strength.

Accepted Answer

A) HZ < HY < HX 
B) HY < HZ < HX 
C) HZ < HX < HY 
D) HX < HZ < HY 
A) HZ < HY < HX 
B) HY < HZ < HX 
C) HZ < HX < HY 
D) HX < HZ < HY

Question 13

Which one of the following salts,when dissolved in water,produces the solution with the highest pH?

Accepted Answer

A) RbI 
B) RbBr 
C) RbCl 
D) RbF 
A) RbI 
B) RbBr 
C) RbCl 
D) RbF

Question 14

The following pictures represent solutions of three salts MA;water molecules have been omitted for clarity.Dotted spheres represent AS1U1P1yS1S1P0S1U1P1-S1S1P0 ions;gray spheres represent MS1U1P1x+S1S1P0 ions;black spheres represent oxygen atoms;and unshaded spheres represent hydrogen atoms.  
-Which picture represents a basic salt?

Accepted Answer

A) (1) 
B) (2) 
C) (3) 
D) None of these 
A) (1) 
B) (2) 
C) (3) 
D) None of these

Question 15

An acidic solution with hydronium ion concentration [H+] = 1.60 × 10-3 M has a hydroxide ion concentration [OH-] = ________.

Accepted Answer

Question 16

What is the pH of a solution prepared by mixing 100.00 mL of 0.020 M Ca(OH)2 with 50.00 mL of 0.100 M NaOH? Assume that the volumes are additive.

Accepted Answer

A) 12.67 
B) 12.78 
C) 12.95 
D) 13.25 
A) 12.67 
B) 12.78 
C) 12.95 
D) 13.25

Question 17

At 50°C the value of Kw is 5.5 × 10-14,and the pH of a neutral solution at 50°C is ________.

Accepted Answer

Question 18

In the following reaction the unshaded spheres represent H atoms.  
-Identify the Br∅nsted-Lowry bases.

Accepted Answer

A) (1)and (3) 
B) (1)and (4) 
C) (2)and (3) 
D) (2)and (4) 
A) (1)and (3) 
B) (1)and (4) 
C) (2)and (3) 
D) (2)and (4)

Question 19

The following pictures represent equal volumes of aqueous solutions of three acids HA (A = X,Y,or Z);water molecules have been omitted for clarity.  
-Arrange the conjugate bases (A- = X-,Y-,or Z-)in order of increasing base strength.

Accepted Answer

A) Z- - - 
B) Y- - - 
C) Z- - - 
D) X- - - 
A) Z- - - 
B) Y- - - 
C) Z- - - 
D) X- - -

Question 20

The following pictures represent aqueous solutions of binary acids of the type HA where the water molecules have been omitted for clarity.  
-Arrange the acids in order of increasing acid strength.

Accepted Answer

A) D < C < A < B 
B) D < C < B < A 
C) D < B < A < C 
D) D < A < C < B 
A) D < C < A < B 
B) D < C < B < A 
C) D < B < A < C 
D) D < A < C < B

Exam 14: Aqueous Equilibria: Acids and Bases

What is the pH of a solution prepared by mixing 100.00 mL of 0.20 M HCl with 150.00 mL of 0.10 M HCl? Assume that the volumes are additive.

Which Br∅nsted-Lowry base has the strongest conjugate acid?

What is the hydronium ion concentration and the pH for an aqueous solution of NH3 that has a hydroxide ion concentration of 2.25 × 10-3 M?

The equilibrium constant for the reaction below has the value Ka = 3.5 × 10-4.In this reaction the stronger Br∅nsted-Lowry acid is ________ and the weaker Br∅nsted-Lowry acid is ________. HF(aq)+ H2O(l)⇌ H3O+(aq)+ F-(aq)

If the ionization constant of water,Kw,at 40°C is 2.92 × 10-14,then what is the hydronium ion concentration for a neutral solution?

Determine the acid dissociation constant for a 0.020 M formic acid solution that has a pH of 2.74.Formic acid is a weak monoprotic acid and the equilibrium equation of interest is HCOOH(aq)+ H2O(l)⇌ H3O+(aq)+ HCO2-(aq).

Aniline, (C6H5NH2,Kb = 4.3 × 10-10 at 25°C)is an industrially important amine used in the making of dyes.Determine the pH of an aniline solution made by dissolving 3.90 g of aniline in enough water to make 100 mL of solution.

What is the strongest Br∅nsted-Lowry acid in the chemical reaction shown below? 2 HNO3(aq)+ Ba(OH)2(aq)→ Ba(NO3)2(aq)+ 2 H2O(l)

Which one of the following salts,when dissolved in water,produces the solution with the lowest pH?

An Arrhenius base is best defined as a

What is the strongest acid among the following?

The following pictures represent equal volumes of aqueous solutions of three acids HA (A = X,Y,or Z);water molecules have been omitted for clarity. -Arrange the acids in order of increasing acid strength.

Which one of the following salts,when dissolved in water,produces the solution with the highest pH?

The following pictures represent solutions of three salts MA;water molecules have been omitted for clarity.Dotted spheres represent Ay- ions;gray spheres represent Mx+ ions;black spheres represent oxygen atoms;and unshaded spheres represent hydrogen atoms. -Which picture represents a basic salt?

An acidic solution with hydronium ion concentration [H+] = 1.60 × 10-3 M has a hydroxide ion concentration [OH-] = ________.

What is the pH of a solution prepared by mixing 100.00 mL of 0.020 M Ca(OH)2 with 50.00 mL of 0.100 M NaOH? Assume that the volumes are additive.

At 50°C the value of Kw is 5.5 × 10-14,and the pH of a neutral solution at 50°C is ________.

In the following reaction the unshaded spheres represent H atoms. -Identify the Br∅nsted-Lowry bases.

The following pictures represent equal volumes of aqueous solutions of three acids HA (A = X,Y,or Z);water molecules have been omitted for clarity. -Arrange the conjugate bases (A- = X-,Y-,or Z-)in order of increasing base strength.

The following pictures represent aqueous solutions of binary acids of the type HA where the water molecules have been omitted for clarity. -Arrange the acids in order of increasing acid strength.

Chemistry: Matter and Measurement

Atoms, molecules, and Ions

Formulas, equations, and Moles

Reactions in Aqueous Solutions

Periodicity and the Atomic Structure of Atoms

Ionic Bonds and Some Main-Group Chemistry

Covalent Bonds and Molecular Structure

Thermochemistry: Chemical Energy

Gases: Their Properties and Behavior

Liquids,solids,and Phase Changes

Solutions and Their Properties

Chemical Kinetics

Chemical Equilibrium

Applications of Aqueous Equilibria

Thermodynamics: Entropy, free Energy, and Equilibrium

Electrochemistry

Hydrogen, oxygen, and Water

The Main-Group Elements

Transition Elements and Coordination Chemistry

Metals and Solid-State Materials

Nuclear Chemistry

Organic and Biological Chemistry

Filters

What is the hydronium ion concentration and the pH for an aqueous solution of NH₃ that has a hydroxide ion concentration of 2.25 × 10^-3 M?

The equilibrium constant for the reaction below has the value K_a = 3.5 × 10^-4.In this reaction the stronger Br∅nsted-Lowry acid is and the weaker Br∅nsted-Lowry acid is . HF(aq)+ H₂O(l)⇌ H₃O⁺(aq)+ F^-(aq)

If the ionization constant of water,K_w,at 40°C is 2.92 × 10^-14,then what is the hydronium ion concentration for a neutral solution?

Determine the acid dissociation constant for a 0.020 M formic acid solution that has a pH of 2.74.Formic acid is a weak monoprotic acid and the equilibrium equation of interest is HCOOH(aq)+ H₂O(l)⇌ H₃O⁺(aq)+ HCO₂^-(aq).

Aniline, (C₆H₅NH₂,K_b = 4.3 × 10^-10 at 25°C)is an industrially important amine used in the making of dyes.Determine the pH of an aniline solution made by dissolving 3.90 g of aniline in enough water to make 100 mL of solution.

What is the strongest Br∅nsted-Lowry acid in the chemical reaction shown below? 2 HNO₃(aq)+ Ba(OH)₂(aq)→ Ba(NO₃)₂(aq)+ 2 H₂O(l)

The following pictures represent solutions of three salts MA;water molecules have been omitted for clarity.Dotted spheres represent A^y^- ions;gray spheres represent M^x+ ions;black spheres represent oxygen atoms;and unshaded spheres represent hydrogen atoms. -Which picture represents a basic salt?

An acidic solution with hydronium ion concentration [H⁺] = 1.60 × 10^-3 M has a hydroxide ion concentration [OH^-] = ________.

What is the pH of a solution prepared by mixing 100.00 mL of 0.020 M Ca(OH)₂ with 50.00 mL of 0.100 M NaOH? Assume that the volumes are additive.

At 50°C the value of K_w is 5.5 × 10^-14,and the pH of a neutral solution at 50°C is ________.

The following pictures represent equal volumes of aqueous solutions of three acids HA (A = X,Y,or Z);water molecules have been omitted for clarity. -Arrange the conjugate bases (A^- = X^-,Y^-,or Z^-)in order of increasing base strength.