Question 1

In which of the following solutions would solid AgCl  be expected to be the least soluble at 25°C?

Accepted Answer

A) 0.1 M HCl 
B) 0.1 M KCl 
C) 0.1 M BaCl2 
D) 0.1 M K NO3 
A) 0.1 M HCl 
B) 0.1 M KCl 
C) 0.1 M BaCl2 
D) 0.1 M K NO3

Question 2

Formic acid (HCO2H,Ka = 1.8 × 10-4)is the principal component in the venom of stinging ants.What is the molarity of a formic acid solution if 25.00 mL of the formic acid solution requires 29.80 mL of 0.0567 M NaOH to reach the equivalence point?

Accepted Answer

A) 0.0134 M 
B) 0.0476 M 
C) 0.0567 M 
D) 0.0676 M 
A) 0.0134 M 
B) 0.0476 M 
C) 0.0567 M 
D) 0.0676 M

Question 3

When equal molar amounts of the following sets of compounds are mixed in water,which will not form a buffer solution?

Accepted Answer

A) KH2PO4 with K2HPO4 
B) NH3 with NH4I 
C) CH3CO2H with LiCH3CO2 
D) HNO3 with LiNO3 
A) KH2PO4 with K2HPO4 
B) NH3 with NH4I 
C) CH3CO2H with LiCH3CO2 
D) HNO3 with LiNO3

Question 4

Precipitation of an ionic compound will occur upon mixing of desired reagents if the initial ion product is

Accepted Answer

A) greater than the Ksp. 
B) equal to the pKsp. 
C) equal to the Ksp. 
D) less than the Ksp. 
A) greater than the Ksp. 
B) equal to the pKsp. 
C) equal to the Ksp. 
D) less than the Ksp.

Question 5

The following pictures represent solutions that contain a weak acid HA (pKS1U1B1aS1U1B0 = 5.0)and its potassium salt KA.Unshaded spheres represent H atoms and shaded spheres represent AS1U1P1-S1S1P0 ions.(KS1U1P1+S1S1P0,HS1U1B13S1U1B0OS1U1P1+S1S1P0,OHS1U1P1-S1S1P0,and solvent HS1U1B12S1U1B0O molecules have been omitted for clarity. )  
-For which of these solutions is pH = pKa?

Accepted Answer

A) All have pH = pKa. 
B) (1), (2)and (3) 
C) (1)and (4) 
D) (2)and (3) 
A) All have pH = pKa. 
B) (1), (2)and (3) 
C) (1)and (4) 
D) (2)and (3)

Question 6

TRIS {(HOCH2)3CNH2} is one of the most common buffers used in biochemistry.A solution is prepared by adding enough TRIS and 12 M HCl(aq)to give 1.00 L of solution with [TRIS] = 0.30 M and [TRISH+] = 0.60 M.What is the pH of this buffered system if the pKb is 5.92?

Accepted Answer

A) 5.92 
B) 6.22 
C) 7.78 
D) 8.08 
A) 5.92 
B) 6.22 
C) 7.78 
D) 8.08

Question 7

What is the pH of a solution made by mixing 30.00 mL of 0.10 M HCl with 40.00 mL of 0.10 M KOH? Assume that the volumes of the solutions are additive.

Accepted Answer

A) 0.85 
B) 1.85 
C) 12.15 
D) 13.15 
A) 0.85 
B) 1.85 
C) 12.15 
D) 13.15

Question 8

In which of the following solutions would solid PbBr2 be expected to be the least soluble at 25°C?

Accepted Answer

A) 0.1 M HBr 
B) 0.1 M LiBr 
C) 0.1 M CaBr2 
D) 0.1 M LiNO3 
A) 0.1 M HBr 
B) 0.1 M LiBr 
C) 0.1 M CaBr2 
D) 0.1 M LiNO3

Question 9

Which is a net ionic equation for the neutralization of a weak acid with a strong base?

Accepted Answer

A) HBr(aq)+ NaOH(aq)⇌ H2O(l)+ NaBr(aq) 
B) H3O+(aq)+ OH-(aq)⇌ 2 H2O(l) 
C) HF(aq)+ LiOH(aq)⇌ H2O(l)+ LiF(aq) 
D) HF(aq)+ OH-(aq)⇌ H2O(l)+ F-(aq) 
A) HBr(aq)+ NaOH(aq)⇌ H2O(l)+ NaBr(aq) 
B) H3O+(aq)+ OH-(aq)⇌ 2 H2O(l) 
C) HF(aq)+ LiOH(aq)⇌ H2O(l)+ LiF(aq) 
D) HF(aq)+ OH-(aq)⇌ H2O(l)+ F-(aq)

Question 10

Use the graphs below to answer the following questions.  
-What is the characteristic pH-titrant curve for the titration of a strong acid by a strong base?

Accepted Answer

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

Question 11

The following pictures represent solutions of AgCl,which may also contain ions other than AgS1U1P1+S1S1P0 and ClS1U1P1-S1S1P0 which are not shown.Gray spheres represent AgS1U1P1+S1S1P0 ions and dotted spheres represent ClS1U1P1-S1S1P0 ions.  
-If solution (1)is a saturated solution of AgCl,which of solutions (1)-(4)represents the solution after a small amount of HCl is added and equilibrium is restored?

Accepted Answer

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

Question 12

The following plot shows two titration curves,each representing the titration of 50.00 mL of 0.100 M acid with 0.100 M NaOH.  
-Which point a-d represents a buffer region?

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 13

At what pH is the amino acid glycine with a Ka of 2.51 × 10-10 sixty-six (66%)percent dissociated?

Accepted Answer

A) 9.60 
B) 9.89 
C) 10.10 
D) 10.60 
A) 9.60 
B) 9.89 
C) 10.10 
D) 10.60

Question 14

The following pictures represent solutions of CuS,which may also contain ions other than CuS1U1P12+S1S1P0 and SS1U1P12-S1S1P0 which are not shown.Gray spheres represent CuS1U1P12+S1S1P0 ions and dotted spheres represent SS1U1P12-S1S1P0 ions.  
-If solution (1)is a saturated solution of CuS,which of solutions (2)-(4)are supersaturated?

Accepted Answer

A) (2) 
B) (3) 
C) (4) 
D) None of these 
A) (2) 
B) (3) 
C) (4) 
D) None of these

Question 15

Addition of 0.0125 mol HCl to 150 mL of a 0.150 M formic acid/0.100 M sodium formate buffer results in a pH = ________.The Ka of formic acid is 1.8 × 10-4.

Accepted Answer

Question 16

What is the pH at the equivalence point of a weak acid-strong base titration?

Accepted Answer

A) pH  7 
D) pH = 14.00 
A) pH  7 
D) pH = 14.00

Question 17

Formic acid (HCO2H,Ka = 1.8 × 10-4)is the principal component in the venom of stinging ants.What is the molarity of a formic acid solution if 25.00 mL of the formic acid solution requires 44.80 mL of 0.0567 M NaOH to reach the equivalence point?

Accepted Answer

A) 0.0134 M 
B) 0.0316 M 
C) 0.0567 M 
D) 0.102 M 
A) 0.0134 M 
B) 0.0316 M 
C) 0.0567 M 
D) 0.102 M

Question 18

What is the percent dissociation of acetic acid if the solution has a pH = 4.74 and a pKa = 4.74?

Accepted Answer

A) 100% 
B) 50% 
C) 10% 
D) 1% 
A) 100% 
B) 50% 
C) 10% 
D) 1%

Question 19

The following plot shows a titration curve for the titration of 1.00 L of 1.00 M diprotic acid HS1U1B12S1U1B0A with NaOH.  
-A buffer region is indicated by which point(s)a-d?

Accepted Answer

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

Question 20

The following pictures represent solutions that contain a weak acid HA (pKS1U1B1aS1U1B0 = 5.0)and its potassium salt KA.Unshaded spheres represent H atoms and shaded spheres represent AS1U1P1-S1S1P0 ions.(KS1U1P1+S1S1P0,HS1U1B13S1U1B0OS1U1P1+S1S1P0,OHS1U1P1-S1S1P0,and solvent HS1U1B12S1U1B0O molecules have been omitted for clarity. )  
-Which solution has the greatest buffer capacity?

Accepted Answer

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

In which of the following solutions would solid AgCl be expected to be the least soluble at 25°C?

Formic acid (HCO₂H,K_a = 1.8 × 10^-4)is the principal component in the venom of stinging ants.What is the molarity of a formic acid solution if 25.00 mL of the formic acid solution requires 29.80 mL of 0.0567 M NaOH to reach the equivalence point?

When equal molar amounts of the following sets of compounds are mixed in water,which will not form a buffer solution?

Precipitation of an ionic compound will occur upon mixing of desired reagents if the initial ion product is

TRIS {(HOCH₂)₃CNH₂} is one of the most common buffers used in biochemistry.A solution is prepared by adding enough TRIS and 12 M HCl(aq)to give 1.00 L of solution with [TRIS] = 0.30 M and [TRISH⁺] = 0.60 M.What is the pH of this buffered system if the pK_b is 5.92?

What is the pH of a solution made by mixing 30.00 mL of 0.10 M HCl with 40.00 mL of 0.10 M KOH? Assume that the volumes of the solutions are additive.

In which of the following solutions would solid PbBr₂ be expected to be the least soluble at 25°C?

Which is a net ionic equation for the neutralization of a weak acid with a strong base?

Use the graphs below to answer the following questions. -What is the characteristic pH-titrant curve for the titration of a strong acid by a strong base?

The following plot shows two titration curves,each representing the titration of 50.00 mL of 0.100 M acid with 0.100 M NaOH. -Which point a-d represents a buffer region?

At what pH is the amino acid glycine with a K_a of 2.51 × 10^-10 sixty-six (66%)percent dissociated?

The following pictures represent solutions of CuS,which may also contain ions other than Cu²⁺ and S^2- which are not shown.Gray spheres represent Cu²⁺ ions and dotted spheres represent S^2- ions. -If solution (1)is a saturated solution of CuS,which of solutions (2)-(4)are supersaturated?

Addition of 0.0125 mol HCl to 150 mL of a 0.150 M formic acid/0.100 M sodium formate buffer results in a pH = ________.The K_a of formic acid is 1.8 × 10^-4.

What is the pH at the equivalence point of a weak acid-strong base titration?

Formic acid (HCO₂H,K_a = 1.8 × 10^-4)is the principal component in the venom of stinging ants.What is the molarity of a formic acid solution if 25.00 mL of the formic acid solution requires 44.80 mL of 0.0567 M NaOH to reach the equivalence point?

What is the percent dissociation of acetic acid if the solution has a pH = 4.74 and a pK_a = 4.74?

The following plot shows a titration curve for the titration of 1.00 L of 1.00 M diprotic acid H₂A with NaOH. -A buffer region is indicated by which point(s)a-d?

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Exam 16: Applications of Aqueous Equilibria

In which of the following solutions would solid AgCl be expected to be the least soluble at 25°C?

Formic acid (HCO2H,Ka = 1.8 × 10-4)is the principal component in the venom of stinging ants.What is the molarity of a formic acid solution if 25.00 mL of the formic acid solution requires 29.80 mL of 0.0567 M NaOH to reach the equivalence point?

When equal molar amounts of the following sets of compounds are mixed in water,which will not form a buffer solution?

Precipitation of an ionic compound will occur upon mixing of desired reagents if the initial ion product is

The following pictures represent solutions that contain a weak acid HA (pKa = 5.0)and its potassium salt KA.Unshaded spheres represent H atoms and shaded spheres represent A- ions.(K+,H3O+,OH-,and solvent H2O molecules have been omitted for clarity. ) -For which of these solutions is pH = pKa?

TRIS {(HOCH2)3CNH2} is one of the most common buffers used in biochemistry.A solution is prepared by adding enough TRIS and 12 M HCl(aq)to give 1.00 L of solution with [TRIS] = 0.30 M and [TRISH+] = 0.60 M.What is the pH of this buffered system if the pKb is 5.92?

What is the pH of a solution made by mixing 30.00 mL of 0.10 M HCl with 40.00 mL of 0.10 M KOH? Assume that the volumes of the solutions are additive.

In which of the following solutions would solid PbBr2 be expected to be the least soluble at 25°C?

Which is a net ionic equation for the neutralization of a weak acid with a strong base?

Use the graphs below to answer the following questions. -What is the characteristic pH-titrant curve for the titration of a strong acid by a strong base?

The following plot shows two titration curves,each representing the titration of 50.00 mL of 0.100 M acid with 0.100 M NaOH. -Which point a-d represents a buffer region?

At what pH is the amino acid glycine with a Ka of 2.51 × 10-10 sixty-six (66%)percent dissociated?

The following pictures represent solutions of CuS,which may also contain ions other than Cu2+ and S2- which are not shown.Gray spheres represent Cu2+ ions and dotted spheres represent S2- ions. -If solution (1)is a saturated solution of CuS,which of solutions (2)-(4)are supersaturated?

Addition of 0.0125 mol HCl to 150 mL of a 0.150 M formic acid/0.100 M sodium formate buffer results in a pH = ________.The Ka of formic acid is 1.8 × 10-4.

What is the pH at the equivalence point of a weak acid-strong base titration?

Formic acid (HCO2H,Ka = 1.8 × 10-4)is the principal component in the venom of stinging ants.What is the molarity of a formic acid solution if 25.00 mL of the formic acid solution requires 44.80 mL of 0.0567 M NaOH to reach the equivalence point?

What is the percent dissociation of acetic acid if the solution has a pH = 4.74 and a pKa = 4.74?

The following plot shows a titration curve for the titration of 1.00 L of 1.00 M diprotic acid H2A with NaOH. -A buffer region is indicated by which point(s)a-d?

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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

Formic acid (HCO₂H,K_a = 1.8 × 10^-4)is the principal component in the venom of stinging ants.What is the molarity of a formic acid solution if 25.00 mL of the formic acid solution requires 29.80 mL of 0.0567 M NaOH to reach the equivalence point?

TRIS {(HOCH₂)₃CNH₂} is one of the most common buffers used in biochemistry.A solution is prepared by adding enough TRIS and 12 M HCl(aq)to give 1.00 L of solution with [TRIS] = 0.30 M and [TRISH⁺] = 0.60 M.What is the pH of this buffered system if the pK_b is 5.92?

In which of the following solutions would solid PbBr₂ be expected to be the least soluble at 25°C?

At what pH is the amino acid glycine with a K_a of 2.51 × 10^-10 sixty-six (66%)percent dissociated?

The following pictures represent solutions of CuS,which may also contain ions other than Cu²⁺ and S^2- which are not shown.Gray spheres represent Cu²⁺ ions and dotted spheres represent S^2- ions. -If solution (1)is a saturated solution of CuS,which of solutions (2)-(4)are supersaturated?

Addition of 0.0125 mol HCl to 150 mL of a 0.150 M formic acid/0.100 M sodium formate buffer results in a pH = ________.The K_a of formic acid is 1.8 × 10^-4.

Formic acid (HCO₂H,K_a = 1.8 × 10^-4)is the principal component in the venom of stinging ants.What is the molarity of a formic acid solution if 25.00 mL of the formic acid solution requires 44.80 mL of 0.0567 M NaOH to reach the equivalence point?

What is the percent dissociation of acetic acid if the solution has a pH = 4.74 and a pK_a = 4.74?

The following plot shows a titration curve for the titration of 1.00 L of 1.00 M diprotic acid H₂A with NaOH. -A buffer region is indicated by which point(s)a-d?