Question 1

What is the pH of a solution made by mixing 20.00 mL of 0.100 M HCl with 40.00 mL of 0.100 M KOH? Assume that the volumes of the solutions are additive.

Accepted Answer

A) 0.48 
B) 1.48 
C) 12.52 
D) 13.52 
A) 0.48 
B) 1.48 
C) 12.52 
D) 13.52

Question 2

The following pictures represent solutions at various stages in the titration of a weak diprotic acid HS1U1B12S1U1B0A with aqueous KOH.Unshaded spheres represent H atoms,black spheres represent oxygen atoms,and shaded spheres represent AS1U1P12-S1S1P0 ions.(KS1U1P1+S1S1P0,HS1U1B13S1U1B0OS1U1P1+S1S1P0 initially present,OHS1U1P1-S1S1P0 initially present and solvent water molecules have been omitted for clarity).  
-Which picture represents the system halfway to the first equivalence point?

Accepted Answer

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

Question 3

The following pictures represent solutions that contain a weak acid HA (pKS1U1B1aS1U1B0 = 5.0)and its potassium salt KA.Unshaded spheres represent H atoms,black spheres represent oxygen atoms,and shaded spheres represent AS1U1P1-S1S1P0 ions.(KS1U1P1+S1S1P0,HS1U1B13S1U1B0OS1U1P1+ S1S1P0initially present,OHS1U1P1- S1S1P0initially present and solvent water molecules have been omitted for clarity. )  
-Which picture represents the equilibrium state of the solution after addition of one OH- ion to the solution shown in picture (1)?

Accepted Answer

A) (2) 
B) (3) 
C) (4) 
D) (5) 
A) (2) 
B) (3) 
C) (4) 
D) (5)

Question 4

The artist's pigment cadmium yellow,CdS,has a water solubility of 0.13 g/L.The solubility product of CdS,Ksp = ________.

Accepted Answer

Question 5

Which of the following titrations result in an acidic solution at the equivalence point?

Accepted Answer

A) CH3COOH titrated with LiOH 
B) NaF titrated with LiOH 
C) HBr titrated with KOH 
D) C5H5N titrated with HCl 
A) CH3COOH titrated with LiOH 
B) NaF titrated with LiOH 
C) HBr titrated with KOH 
D) C5H5N titrated with HCl

Question 6

What is the hydronium ion concentration in a solution prepared by mixing 50.00 mL of 0.10 M HCN with 50.00 mL of   NaCN? Assume that the volumes of the solutions are additive and that Ka = 4.9 × 10-10 for HCN.

Accepted Answer

A) 4.9 × 10-11 M 
B) 4.9 × 10-10 M 
C) 4.9 × 10-9 M 
D) 7.0 × 10-6 M 
A) 4.9 × 10-11 M 
B) 4.9 × 10-10 M 
C) 4.9 × 10-9 M 
D) 7.0 × 10-6 M

Question 7

Which of these neutralization reactions has a pH < 7 when equal molar amounts of acid and base are mixed?

Accepted Answer

A) CH3CO2H(aq)+ NaOH(aq)⇌ H2O(l)+ NaCH3CO2(aq) 
B) HCl(aq)+ C5H5N(aq)⇌ C5H5NHCl(aq) 
C) HBr(aq)+ KOH(aq)⇌ H2O(l)+ KBr(aq) 
D) H2SO4(aq)+ 2 NaOH(aq)⇌2 H2O(l)+ Na2SO4(aq) 
A) CH3CO2H(aq)+ NaOH(aq)⇌ H2O(l)+ NaCH3CO2(aq) 
B) HCl(aq)+ C5H5N(aq)⇌ C5H5NHCl(aq) 
C) HBr(aq)+ KOH(aq)⇌ H2O(l)+ KBr(aq) 
D) H2SO4(aq)+ 2 NaOH(aq)⇌2 H2O(l)+ Na2SO4(aq)

Question 8

The following pictures represent solutions at various points in the titration of a weak acid HA with aqueous KOH.Unshaded spheres represent H atoms,black spheres represent oxygen atoms,and shaded spheres represent AS1U1P1-S1S1P0 ions.(KS1U1P1+S1S1P0,HS1U1B13S1U1B0OS1U1P1+S1S1P0 initially present,OHS1U1P1-S1S1P0 initially present and solvent water molecules have been omitted for clarity).  
-Which picture represents the solution at the equivalence point?

Accepted Answer

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

Question 9

What is the hydronium ion concentration in a solution prepared by mixing 50.00 mL of 0.10 M HCN with 50.00 mL of   NaCN? Assume that the volumes of the solutions are additive and that Ka = 4.9 × 10-10 for HCN.

Accepted Answer

A) 2.4 × 10-10 M 
B) 4.9 × 10-10 M 
C) 9.8 × 10-10 M 
D) 7.0 × 10-6 M 
A) 2.4 × 10-10 M 
B) 4.9 × 10-10 M 
C) 9.8 × 10-10 M 
D) 7.0 × 10-6 M

Question 10

The neutralization constant Kn for the neutralization of penicillin V (C16H18N2O5S)and erythromycin (C37H67NO13)is 1.3 × 106.The acid dissociation constant Ka for penicillin V is 2.0 × 10-3.What is the base dissociation constant Kb for erythromycin?

Accepted Answer

Question 11

What is the pH at the equivalence point of a weak base-strong acid titration if 20.00 mL of NaOCl requires 28.30 mL of 0.20 M HCl? Ka = 3.0 × 10-8 for HOCl.

Accepted Answer

A) 0.70 
B) 3.39 
C) 3.76 
D) 4.23 
A) 0.70 
B) 3.39 
C) 3.76 
D) 4.23

Question 12

Identify the following solutions as acidic,basic,or inert.
NaNO2 _______
NaNO3 ________
C5H5NHClO4 ________

Accepted Answer

Question 13

The following plot shows a titration curve for the titration of 1.00 L of 1.00 M diprotic acid HS1U1B12S1U1B0A with NaOH.  
-Which point a-d represents the second equivalence point?

Accepted Answer

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

Question 14

What is not a correct expression for the weak acid HA?

Accepted Answer

A) Ka = [H3O+][A-]/[HA] 
B) pKa = pH - log{[A-]/[HA]} 
C) pKa = logKa 
D) pKa = 14 - pKb 
A) Ka = [H3O+][A-]/[HA] 
B) pKa = pH - log{[A-]/[HA]} 
C) pKa = logKa 
D) pKa = 14 - pKb

Question 15

A buffer prepared by mixing equal moles of an acid having Ka = 4.5 × 10-4 and a salt of its conjugate base has a pH = ________.

Accepted Answer

Question 16

The dissociation equilibrium constants for the protonated form of alanine (a diprotic amino acid,H2X+)are Ka1 = 4.6 × 10-3 and Ka2 = 2.0 × 10-10.What is the pH of 50.00 mL of a 0.0500 M solution of alanine after 25.00 mL of 0.100 M NaOH has been added?

Accepted Answer

A) 2.34 
B) 4.85 
C) 5.59 
D) 6.72 
A) 2.34 
B) 4.85 
C) 5.59 
D) 6.72

Question 17

What is the molar solubility of AgCl in 0.10 M NaCN if the colorless complex ion Ag(CN)2- forms? Ksp for AgCl is 1.8 × 10-10 and Kf for Ag(CN)2- is 1.0 × 1021.

Accepted Answer

A) 0.050 M 
B) 0.10 M 
C) 0.20 M 
D) 0.40 M 
A) 0.050 M 
B) 0.10 M 
C) 0.20 M 
D) 0.40 M

Question 18

The following pictures represent solutions at various stages in the titration of a weak diprotic acid HS1U1B12S1U1B0A with aqueous KOH.Unshaded spheres represent H atoms,black spheres represent oxygen atoms,and shaded spheres represent AS1U1P12-S1S1P0 ions.(KS1U1P1+S1S1P0,HS1U1B13S1U1B0OS1U1P1+S1S1P0 initially present,OHS1U1P1-S1S1P0 initially present and solvent water molecules have been omitted for clarity).  
-Which picture represents the system halfway between the first and second equivalence points?

Accepted Answer

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

Question 19

What is the pH of a solution prepared by mixing 25.00 mL of 0.10 M CH3CO2H with 25.00 mL of 0.050 M CH3CO2Na? Assume that the volume of the solutions are additive and that Ka = 1.8 × 10-5 for CH3CO2H.

Accepted Answer

A) 2.87 
B) 4.44 
C) 4.74 
D) 5.05 
A) 2.87 
B) 4.44 
C) 4.74 
D) 5.05

Question 20

The following pictures represent solutions of CaCOS1U1B13S1U1B0,which may also contain ions other than CaS1U1P12+S1S1P0 and COS1U1B13S1U1B0S1U1P12-S1S1P0 which are not shown.Gray spheres represent CaS1U1P12+S1S1P0 ions and unshaded spheres represent COS1U1B13S1U1B0S1U1P12-S1S1P0 ions.  
-If solution (1)is a saturated solution of CaCO3,which of solutions (1)-(4)represents the solution after a small amount of K2CO3 is added and equilibrium is restored?

Accepted Answer

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

What is the pH of a solution made by mixing 20.00 mL of 0.100 M HCl with 40.00 mL of 0.100 M KOH? Assume that the volumes of the solutions are additive.

The artist's pigment cadmium yellow,CdS,has a water solubility of 0.13 g/L.The solubility product of CdS,K_sp = ________.

Which of the following titrations result in an acidic solution at the equivalence point?

What is the hydronium ion concentration in a solution prepared by mixing 50.00 mL of 0.10 M HCN with 50.00 mL of NaCN? Assume that the volumes of the solutions are additive and that K_a = 4.9 × 10^-10for HCN.

Which of these neutralization reactions has a pH < 7 when equal molar amounts of acid and base are mixed?

What is the hydronium ion concentration in a solution prepared by mixing 50.00 mL of 0.10 M HCN with 50.00 mL of NaCN? Assume that the volumes of the solutions are additive and that K_a = 4.9 × 10^-10 for HCN.

The neutralization constant K_n for the neutralization of penicillin V (C₁₆H₁₈N₂O₅S)and erythromycin (C₃₇H₆₇NO₁₃)is 1.3 × 10⁶.The acid dissociation constant K_a for penicillin V is 2.0 × 10^-3.What is the base dissociation constant K_b for erythromycin?

What is the pH at the equivalence point of a weak base-strong acid titration if 20.00 mL of NaOCl requires 28.30 mL of 0.20 M HCl? K_a = 3.0 × 10^-8 for HOCl.

Identify the following solutions as acidic,basic,or inert. NaNO₂ _ NaNO₃ C₅H₅NHClO₄ __

The following plot shows a titration curve for the titration of 1.00 L of 1.00 M diprotic acid H₂A with NaOH. -Which point a-d represents the second equivalence point?

What is not a correct expression for the weak acid HA?

A buffer prepared by mixing equal moles of an acid having K_a = 4.5 × 10^-4 and a salt of its conjugate base has a pH = ________.

The dissociation equilibrium constants for the protonated form of alanine (a diprotic amino acid,H₂X⁺)are K_a1 = 4.6 × 10^-3 and K_a2 = 2.0 × 10^-10.What is the pH of 50.00 mL of a 0.0500 M solution of alanine after 25.00 mL of 0.100 M NaOH has been added?

What is the molar solubility of AgCl in 0.10 M NaCN if the colorless complex ion Ag(CN)₂^- forms? K_sp for AgCl is 1.8 × 10^-10 and K_f for Ag(CN)₂^- is 1.0 × 10²¹.

What is the pH of a solution prepared by mixing 25.00 mL of 0.10 M CH₃CO₂H with 25.00 mL of 0.050 M CH₃CO₂Na? Assume that the volume of the solutions are additive and that K_a = 1.8 × 10^-5 for CH₃CO₂H.

Chemical Tools: Experimentation and Measurement

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Reactions in Aqueous Solutions

Periodicity and the Electronic Structure of Atoms

Ionic Compounds: Periodic Trends and Bonding

Covalent Bonding and Electron-Dot Structures

Covalent Compounds: Bonding Theories and Molecular Structure

Thermochemistry: Chemical Energy

Gases: Their Properties and Behavior

Liquids, solids, and Phase Changes

Solutions and Their Properties

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Chemical Equilibrium

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Exam 16: Applications of Aqueous Equilibria

What is the pH of a solution made by mixing 20.00 mL of 0.100 M HCl with 40.00 mL of 0.100 M KOH? Assume that the volumes of the solutions are additive.

The artist's pigment cadmium yellow,CdS,has a water solubility of 0.13 g/L.The solubility product of CdS,Ksp = ________.

Which of the following titrations result in an acidic solution at the equivalence point?

What is the hydronium ion concentration in a solution prepared by mixing 50.00 mL of 0.10 M HCN with 50.00 mL of NaCN? Assume that the volumes of the solutions are additive and that Ka = 4.9 × 10-10 for HCN.

Which of these neutralization reactions has a pH < 7 when equal molar amounts of acid and base are mixed?

What is the hydronium ion concentration in a solution prepared by mixing 50.00 mL of 0.10 M HCN with 50.00 mL of NaCN? Assume that the volumes of the solutions are additive and that Ka = 4.9 × 10-10 for HCN.

The neutralization constant Kn for the neutralization of penicillin V (C16H18N2O5S)and erythromycin (C37H67NO13)is 1.3 × 106.The acid dissociation constant Ka for penicillin V is 2.0 × 10-3.What is the base dissociation constant Kb for erythromycin?

What is the pH at the equivalence point of a weak base-strong acid titration if 20.00 mL of NaOCl requires 28.30 mL of 0.20 M HCl? Ka = 3.0 × 10-8 for HOCl.

Identify the following solutions as acidic,basic,or inert. NaNO2 _______ NaNO3 ________ C5H5NHClO4 ________

The following plot shows a titration curve for the titration of 1.00 L of 1.00 M diprotic acid H2A with NaOH. -Which point a-d represents the second equivalence point?

What is not a correct expression for the weak acid HA?

A buffer prepared by mixing equal moles of an acid having Ka = 4.5 × 10-4 and a salt of its conjugate base has a pH = ________.

The dissociation equilibrium constants for the protonated form of alanine (a diprotic amino acid,H2X+)are Ka1 = 4.6 × 10-3 and Ka2 = 2.0 × 10-10.What is the pH of 50.00 mL of a 0.0500 M solution of alanine after 25.00 mL of 0.100 M NaOH has been added?

What is the molar solubility of AgCl in 0.10 M NaCN if the colorless complex ion Ag(CN)2- forms? Ksp for AgCl is 1.8 × 10-10 and Kf for Ag(CN)2- is 1.0 × 1021.

What is the pH of a solution prepared by mixing 25.00 mL of 0.10 M CH3CO2H with 25.00 mL of 0.050 M CH3CO2Na? Assume that the volume of the solutions are additive and that Ka = 1.8 × 10-5 for CH3CO2H.

Chemical Tools: Experimentation and Measurement

Atoms, molecules, and Ions

Mass Relationships in Chemical Reactions

Reactions in Aqueous Solutions

Periodicity and the Electronic Structure of Atoms

Ionic Compounds: Periodic Trends and Bonding

Covalent Bonding and Electron-Dot Structures

Covalent Compounds: Bonding Theories and Molecular Structure

Thermochemistry: Chemical Energy

Gases: Their Properties and Behavior

Liquids, solids, and Phase Changes

Solutions and Their Properties

Chemical Kinetics

Chemical Equilibrium

Aqueous Equilibria: Acids and Bases

Thermodynamics: Entropy, free Energy, and Equilibrium

Electrochemistry

Nuclear Chemistry

Transition Elements and Coordination Chemistry

Metals and Solid-State Materials

The Main-Group Elements

Connections to Organic and Biological Chemistry

Filters

The artist's pigment cadmium yellow,CdS,has a water solubility of 0.13 g/L.The solubility product of CdS,K_sp = ________.

What is the hydronium ion concentration in a solution prepared by mixing 50.00 mL of 0.10 M HCN with 50.00 mL of NaCN? Assume that the volumes of the solutions are additive and that K_a = 4.9 × 10^-10for HCN.

What is the hydronium ion concentration in a solution prepared by mixing 50.00 mL of 0.10 M HCN with 50.00 mL of NaCN? Assume that the volumes of the solutions are additive and that K_a = 4.9 × 10^-10 for HCN.

The neutralization constant K_n for the neutralization of penicillin V (C₁₆H₁₈N₂O₅S)and erythromycin (C₃₇H₆₇NO₁₃)is 1.3 × 10⁶.The acid dissociation constant K_a for penicillin V is 2.0 × 10^-3.What is the base dissociation constant K_b for erythromycin?

What is the pH at the equivalence point of a weak base-strong acid titration if 20.00 mL of NaOCl requires 28.30 mL of 0.20 M HCl? K_a = 3.0 × 10^-8 for HOCl.

Identify the following solutions as acidic,basic,or inert. NaNO₂ _ NaNO₃ C₅H₅NHClO₄ __

The following plot shows a titration curve for the titration of 1.00 L of 1.00 M diprotic acid H₂A with NaOH. -Which point a-d represents the second equivalence point?

A buffer prepared by mixing equal moles of an acid having K_a = 4.5 × 10^-4 and a salt of its conjugate base has a pH = ________.

The dissociation equilibrium constants for the protonated form of alanine (a diprotic amino acid,H₂X⁺)are K_a1 = 4.6 × 10^-3 and K_a2 = 2.0 × 10^-10.What is the pH of 50.00 mL of a 0.0500 M solution of alanine after 25.00 mL of 0.100 M NaOH has been added?

What is the molar solubility of AgCl in 0.10 M NaCN if the colorless complex ion Ag(CN)₂^- forms? K_sp for AgCl is 1.8 × 10^-10 and K_f for Ag(CN)₂^- is 1.0 × 10²¹.

What is the pH of a solution prepared by mixing 25.00 mL of 0.10 M CH₃CO₂H with 25.00 mL of 0.050 M CH₃CO₂Na? Assume that the volume of the solutions are additive and that K_a = 1.8 × 10^-5 for CH₃CO₂H.