Question 1

What is the pH of a 0.25 M NH4Cl solution (Kb of NH3 = 1.76 $\times$ 10-5)?

Accepted Answer

The answer of What is the pH of a 0.25...

Question 2

Suppose a 1.0 L solution containing 0.20 moles of morphine is titrated with 0.40 M HCl.The pH at the equivalence point is 4.543.What is the Kb of morphine?

Accepted Answer

A)  1.1  ×	imes×  10-6
B)  9.4  ×	imes× 10-9
C)  1.6  ×	imes×  10-6
D)  6.2  ×	imes×  10-9
E)  Insufficient information is provided to determine Kb. F) A) and E)
G) A) and D)

Question 3

Three acids found in foods are lactic acid (in milk products) ,oxalic acid (in rhubarb) ,and malic acid (in apples) .The pKa values are LA = 3.88,OA = 1.23,and MA = 3.40.Which list has these acids in order of decreasing acid strength?

Accepted Answer

A)  LA > OA > MA
B)  LA > MA > OA
C)  OA > MA > LA
D)  OA > LA > MA
E)  MA > LA > OAF) C) and D)
G) B) and C)

Question 4

What is the pH of a solution made from 46.20 mL of a 0.0500 molar nitric acid solution diluted to 100.0 mL?

Accepted Answer

The answer of What is the pH of a solution...

Question 5

How many moles of sodium acetate must be added to 500.0 mL of 0.250 M acetic acid solution to produce a solution with a pH of 4.94? (The pKa of acetic acid is 4.74.)

Accepted Answer

A)  0.011 moles
B)  0.021 moles
C)  0.13 moles
D)  0.20 moles
E)  0.21 molesF) B) and E)
G) A) and C)

Question 6

Which of the following statements regarding physiological pH and the carbonic acid-bicarbonate buffer system is NOT correct? CO2(aq) + H2O( 2(aq) + H2O(   )  \leftrightarrows   H2CO3(aq)  \leftrightarrows   H+(aq) + HCO3-(aq)  A) The carbonic acid-bicarbonate buffer system regulates the concentration of CO2 dissolved in blood. B) When the amount of CO2 dissolved in blood decreases,the pH increases. C) When CO2 is produced by respiration,the system shifts to the right. D) When acid is added,the system shifts left,which prevents a large pH decrease. E) When base is added,the system shifts right,which prevents a large pH increase. " class="answers-bank-image d-inline" rel="preload" > )  ⇆\leftrightarrows⇆   H2CO3(aq)  ⇆\leftrightarrows⇆   H+(aq) + HCO3-(aq)

Accepted Answer

A)  The carbonic acid-bicarbonate buffer system regulates the concentration of CO2 dissolved in blood.
B)  When the amount of CO2 dissolved in blood decreases,the pH increases.
C)  When CO2 is produced by respiration,the system shifts to the right.
D)  When acid is added,the system shifts left,which prevents a large pH decrease.
E)  When base is added,the system shifts right,which prevents a large pH increase. F) A) and D)
G) C) and D)

Question 7

Which of the following would be the best choice for preparing a buffer with a pH = 5.0?

Accepted Answer

A)  a solution of formic acid and sodium formate,Ka = 1.8  ×	imes×  10-4
B)  a solution of acetic acid and sodium acetate,Ka = 1.8  ×	imes×  10-5
C)  a solution of hypochlorous acid and sodium hypochlorite,Ka = 3.5  ×	imes×  10-8
D)  a solution of boric acid and sodium borate,Ka = 5.8  ×	imes×  10-10
E)  All of these solutions would be equally good choices for making this buffer. F) A) and D)
G) B) and E)

Question 8

The degree of ionization of a weak acid __________ I.varies with the concentration of the acid.
II.depends on the value of Ka.
III.is 100%.
IV.is greater than 50% but less than 100%.

Accepted Answer

A)  I only
B)  II only
C)  III only
D)  both I and II
E)  IV onlyF) C) and D)
G) A) and C)

Question 9

In the following reaction in aqueous solution,the acid reactant is __________ and its conjugate base product is __________. CH3COOH(aq) + NH3(aq)  ⇆\leftrightarrows⇆   CH3COO-(aq) + NH4+(aq)

Accepted Answer

A)  CH3COOH; CH3COO-
B)  CH3COOH; NH4+
C)  NH3; CH3COO-
D)  NH3; NH4+
E)  CH3COOH; H3O+ F) C) and D)
G) B) and D)

Question 10

What reaction occurs as a hydrochloric acid solution is added to a solution containing equal concentrations of acetic acid and sodium acetate?

Accepted Answer

A)  CH3COOH(aq) + H+(aq)  →	o→  CH3COOH2+(aq) 
B)  CH3COO-(aq) + H+(aq)  →	o→   CH3COOH(aq) 
C)  CH3COOH(aq) + HCl(aq)  →	o→  CH3COO-(aq) + H2Cl+(aq) 
D)  2 CH3COO-(aq) + 2 H+(aq)  →	o→   CH3COO(aq) + H2(g) 
E)  CH3COOH(aq) + H+(aq)  →	o→  CH3CO+(aq) + H2O( 3COOH(aq) + H+(aq)  	o  CH3COOH2+(aq)  
B)  CH3COO-(aq) + H+(aq)  	o   CH3COOH(aq)  
C)  CH3COOH(aq) + HCl(aq)  	o  CH3COO-(aq) + H2Cl+(aq)  
D)  2 CH3COO-(aq) + 2 H+(aq)  	o   CH3COO(aq) + H2(g)  
E)  CH3COOH(aq) + H+(aq)  	o  CH3CO+(aq) + H2O(   )  " class="answers-bank-image d-inline" rel="preload" > )  F) A) and B)
G) B) and E)

Question 11

Vitamin C is a monoprotic weak acid,which is also called ascorbic acid (C6H8O5,176 g/mol) .A vitamin C tablet weighing 0.75 g was dissolved in 50.0 mL of water and titrated with 0.250 M sodium hydroxide.It took 12.5 mL of the NaOH solution to reach the end point.What is the percentage of vitamin C in the tablet? Only the vitamin C reacted with the NaOH.

Accepted Answer

A)  98.7%
B)  64.2%
C)  87.7%
D)  95.5%
E)  73.3%F) A) and B)
G) A) and C)

Question 12

The solubility product for CaF2 is written as __________,where s is the molar solubility.

Accepted Answer

A)  Ksp = s2
B)  Ksp = 4s3
C)  Ksp = 4s2
D)  Ksp = 2s3
E)  Ksp = 2s2F) A) and E)
G) A) and B)

Question 13

What is the percent dissociation of 0.150 M triethylamine? (The Kb value for triethylamine is 5.25  ×	imes×  10-4.)

Accepted Answer

A)  5.92%
B)  5.75  ×	imes×  10-3%
C)  39.4%
D)  5.90  ×	imes×  10-3%
E)  5.75% F) A) and B)
G) A) and C)

Question 14

As the pH decreases,the solubility of __________ would increase.

Accepted Answer

A)  lead(II) chloride
B)  silver iodate
C)  calcium carbonate
D)  mercury(I) bromide
E)  silver chlorideF) A) and B)
G) B) and E)

Question 15

Which of the following lists the conjugate acid of HAsO42- first and its conjugate base second?

Accepted Answer

A)  H3O+; AsO43-
B)  AsO43-; H2AsO4-
C)  H3AsO4; AsO43-
D)  AsO43-;H3AsO4
E)  H2AsO4-; AsO43-F) B) and C)
G) None of the above

Question 16

Glycolic acid,which is a monoprotic acid and a constituent in sugarcane,has a pKa of 3.9.A 25.0 mL solution of glycolic acid is titrated to the stoichiometric point with 35.8 mL of 0.020 M sodium hydroxide solution.What is the pH of the resulting solution at the stoichiometric point?

Accepted Answer

A)  4.12
B)  9.88
C)  6.01
D)  7.99
E)  Insufficient information is provided to determine the pH.F) B) and E)
G) C) and E)

Question 17

Which one of the following is NOT a strong base?

Accepted Answer

A)  lithium hydroxide,LiOH
B)  sodium hydroxide,NaOH
C)  potassium hydroxide,KOH
D)  calcium hydroxide,Ca(OH) 2
E)  ammonium hydroxide,NH4OHF) A) and C)
G) C) and D)

Question 18

What is the percent ionization of 0.45 M hydrocyanic acid (HCN,pKa = 9.21)?

Accepted Answer

Question 19

Which sketch best represents the qualitative molecular view of an aqueous solution of nitrous acid? (Water molecules are not shown explicitly.)

Accepted Answer

A)   
B)   
C)   
D)   
E)  none of theseF) A) and C)
G) B) and D)

Question 20

When sodium chloride is added to a saturated solution of lead(II) chloride,some of the lead(II) chloride precipitates.This phenomenon is called __________

Accepted Answer

A)  the common-ion effect.
B)  selective precipitation.
C)  supersaturation.
D)  a solubility anomaly.
E)  deionization.F) B) and E)
G) D) and E)

Exam 15: Aqueous Equilibria-Chemistry of the Water World

What is the pH of a solution made from 46.20 mL of a 0.0500 molar nitric acid solution diluted to 100.0 mL?

Correct Answer
verified

What is the pH of a 0.25 M NH₄Cl solution (K_b of NH₃ = 1.76 $\times$ 10^-⁵)?

Correct Answer
verified

As the pH decreases,the solubility of __________ would increase.

Correct Answer
verified

The degree of ionization of a weak acid __________ I.varies with the concentration of the acid. II.depends on the value of K_a. III.is 100%. IV.is greater than 50% but less than 100%.

Correct Answer
verified

Which of the following would be the best choice for preparing a buffer with a pH = 5.0?

Correct Answer
verified

What reaction occurs as a hydrochloric acid solution is added to a solution containing equal concentrations of acetic acid and sodium acetate?

Correct Answer
verified

In the following reaction in aqueous solution,the acid reactant is and its conjugate base product is . CH₃COOH(aq) + NH₃(aq) $\leftrightarrows$ CH₃COO^-(aq) + NH₄⁺(aq)

Correct Answer
verified

The solubility product for CaF₂ is written as __________,where s is the molar solubility.

Correct Answer
verified

Correct Answer
verified

Glycolic acid,which is a monoprotic acid and a constituent in sugarcane,has a pK_a of 3.9.A 25.0 mL solution of glycolic acid is titrated to the stoichiometric point with 35.8 mL of 0.020 M sodium hydroxide solution.What is the pH of the resulting solution at the stoichiometric point?

Correct Answer
verified

How many moles of sodium acetate must be added to 500.0 mL of 0.250 M acetic acid solution to produce a solution with a pH of 4.94? (The pK_a of acetic acid is 4.74.)

Correct Answer
verified

Suppose a 1.0 L solution containing 0.20 moles of morphine is titrated with 0.40 M HCl.The pH at the equivalence point is 4.543.What is the K_b of morphine?

Correct Answer
verified

Three acids found in foods are lactic acid (in milk products) ,oxalic acid (in rhubarb) ,and malic acid (in apples) .The pK_a values are LA = 3.88,OA = 1.23,and MA = 3.40.Which list has these acids in order of decreasing acid strength?

Correct Answer
verified

Which one of the following is NOT a strong base?

Correct Answer
verified

Correct Answer
verified

What is the percent ionization of 0.45 M hydrocyanic acid (HCN,pK_a = 9.21)?

Correct Answer
verified

Which of the following lists the conjugate acid of HAsO₄^2- first and its conjugate base second?

Correct Answer
verified

Which sketch best represents the qualitative molecular view of an aqueous solution of nitrous acid? (Water molecules are not shown explicitly.)

Correct Answer
verified

When sodium chloride is added to a saturated solution of lead(II) chloride,some of the lead(II) chloride precipitates.This phenomenon is called __________

Correct Answer
verified

What is the percent dissociation of 0.150 M triethylamine? (The K_b value for triethylamine is 5.25 $\times$ 10^-⁴.)

Correct Answer
verified

Exam 15: Aqueous Equilibria-Chemistry of the Water World

What is the pH of a solution made from 46.20 mL of a 0.0500 molar nitric acid solution diluted to 100.0 mL?

Correct AnswerverifiedShow Answer

What is the pH of a 0.25 M NH4Cl solution (Kb of NH3 = 1.76 ×\times× 10-5)?

Correct AnswerverifiedShow Answer

As the pH decreases,the solubility of __________ would increase.

Correct AnswerverifiedShow Answer

The degree of ionization of a weak acid __________ I.varies with the concentration of the acid. II.depends on the value of Ka. III.is 100%. IV.is greater than 50% but less than 100%.

Correct AnswerverifiedShow Answer

Which of the following would be the best choice for preparing a buffer with a pH = 5.0?

Correct AnswerverifiedShow Answer

What reaction occurs as a hydrochloric acid solution is added to a solution containing equal concentrations of acetic acid and sodium acetate?

Correct AnswerverifiedShow Answer

In the following reaction in aqueous solution,the acid reactant is __________ and its conjugate base product is __________. CH3COOH(aq) + NH3(aq) ⇆\leftrightarrows⇆ CH3COO-(aq) + NH4+(aq)

Correct AnswerverifiedShow Answer

The solubility product for CaF2 is written as __________,where s is the molar solubility.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Glycolic acid,which is a monoprotic acid and a constituent in sugarcane,has a pKa of 3.9.A 25.0 mL solution of glycolic acid is titrated to the stoichiometric point with 35.8 mL of 0.020 M sodium hydroxide solution.What is the pH of the resulting solution at the stoichiometric point?

Correct AnswerverifiedShow Answer

How many moles of sodium acetate must be added to 500.0 mL of 0.250 M acetic acid solution to produce a solution with a pH of 4.94? (The pKa of acetic acid is 4.74.)

Correct AnswerverifiedShow Answer

Suppose a 1.0 L solution containing 0.20 moles of morphine is titrated with 0.40 M HCl.The pH at the equivalence point is 4.543.What is the Kb of morphine?

Correct AnswerverifiedShow Answer

Three acids found in foods are lactic acid (in milk products) ,oxalic acid (in rhubarb) ,and malic acid (in apples) .The pKa values are LA = 3.88,OA = 1.23,and MA = 3.40.Which list has these acids in order of decreasing acid strength?

Correct AnswerverifiedShow Answer

Which one of the following is NOT a strong base?

Correct AnswerverifiedShow Answer

Which of the following statements regarding physiological pH and the carbonic acid-bicarbonate buffer system is NOT correct? CO2(aq) + H2O( ) ⇆\leftrightarrows⇆ H2CO3(aq) ⇆\leftrightarrows⇆ H+(aq) + HCO3-(aq)

Correct AnswerverifiedShow Answer

What is the percent ionization of 0.45 M hydrocyanic acid (HCN,pKa = 9.21)?

Correct AnswerverifiedShow Answer

Which of the following lists the conjugate acid of HAsO42- first and its conjugate base second?

Correct AnswerverifiedShow Answer

Which sketch best represents the qualitative molecular view of an aqueous solution of nitrous acid? (Water molecules are not shown explicitly.)

Correct AnswerverifiedShow Answer

When sodium chloride is added to a saturated solution of lead(II) chloride,some of the lead(II) chloride precipitates.This phenomenon is called __________

Correct AnswerverifiedShow Answer

What is the percent dissociation of 0.150 M triethylamine? (The Kb value for triethylamine is 5.25 ×\times× 10-4.)

Correct AnswerverifiedShow Answer

Correct Answer
verified

What is the pH of a 0.25 M NH₄Cl solution (K_b of NH₃ = 1.76 $\times$ 10^-⁵)?

Correct Answer
verified

Correct Answer
verified

The degree of ionization of a weak acid __________ I.varies with the concentration of the acid. II.depends on the value of K_a. III.is 100%. IV.is greater than 50% but less than 100%.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

In the following reaction in aqueous solution,the acid reactant is and its conjugate base product is . CH₃COOH(aq) + NH₃(aq) $\leftrightarrows$ CH₃COO^-(aq) + NH₄⁺(aq)

Correct Answer
verified

The solubility product for CaF₂ is written as __________,where s is the molar solubility.

Correct Answer
verified

Correct Answer
verified

Glycolic acid,which is a monoprotic acid and a constituent in sugarcane,has a pK_a of 3.9.A 25.0 mL solution of glycolic acid is titrated to the stoichiometric point with 35.8 mL of 0.020 M sodium hydroxide solution.What is the pH of the resulting solution at the stoichiometric point?

Correct Answer
verified

How many moles of sodium acetate must be added to 500.0 mL of 0.250 M acetic acid solution to produce a solution with a pH of 4.94? (The pK_a of acetic acid is 4.74.)

Correct Answer
verified

Suppose a 1.0 L solution containing 0.20 moles of morphine is titrated with 0.40 M HCl.The pH at the equivalence point is 4.543.What is the K_b of morphine?

Correct Answer
verified

Three acids found in foods are lactic acid (in milk products) ,oxalic acid (in rhubarb) ,and malic acid (in apples) .The pK_a values are LA = 3.88,OA = 1.23,and MA = 3.40.Which list has these acids in order of decreasing acid strength?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

What is the percent ionization of 0.45 M hydrocyanic acid (HCN,pK_a = 9.21)?

Correct Answer
verified

Which of the following lists the conjugate acid of HAsO₄^2- first and its conjugate base second?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

What is the percent dissociation of 0.150 M triethylamine? (The K_b value for triethylamine is 5.25 $\times$ 10^-⁴.)

Correct Answer
verified