Question 1

Which statement A-D is not correct? Pure water at 25C has ________

Accepted Answer

A)  Kw  1.0  1014.
B)  pOH  7.
C)  [H3O]  [OH].
D)  pH  7.
E)  A-D are all correct.

Question 2

Write the reaction and equilibrium constant that describes the autoionization of water.

Accepted Answer

The answer of Write the reaction and equilibrium constant that...

Question 3

When [H]  4.0  109 M in water at 25C, then ________

Accepted Answer

A)  pH  9.40.
B)  pH  7.00.
C)  pH  8.40.
D)  pH  8.40.
E)  pH  9.40.

Question 4

What is the concentration of the acetate ion in a 1.00 M CH3COOH solution given that the Ka of CH3COOH is 1.8 F1F1F1S1F1F1F10 10F1F1F1S1F1F1F105?

Accepted Answer

4.20 F1F1F...

Question 5

Define a conjugate acidF1F1F1S1F1F1F10base pair and provide an example.

Accepted Answer

A conjugate acid<font face="symbol">F1F1F...

Question 6

Phosphoric acid is a triprotic acid, ionizing in the following sequential steps: H3PO4  H2O 3PO4  H2O   H2PO4  H3O   H2PO4  H2O   HPO42  H3O   HPO42  H2O   PO43  H3O   What is the Kb expression for the base, sodium phosphate? A)    B)    C)    D)    E)   " class="answers-bank-image d-inline" rel="preload" > H2PO4  H3O 3PO4  H2O   H2PO4  H3O   H2PO4  H2O   HPO42  H3O   HPO42  H2O   PO43  H3O   What is the Kb expression for the base, sodium phosphate? A)    B)    C)    D)    E)   " class="answers-bank-image d-inline" rel="preload" > H2PO4  H2O 3PO4  H2O   H2PO4  H3O   H2PO4  H2O   HPO42  H3O   HPO42  H2O   PO43  H3O   What is the Kb expression for the base, sodium phosphate? A)    B)    C)    D)    E)   " class="answers-bank-image d-inline" rel="preload" > HPO42  H3O 3PO4  H2O   H2PO4  H3O   H2PO4  H2O   HPO42  H3O   HPO42  H2O   PO43  H3O   What is the Kb expression for the base, sodium phosphate? A)    B)    C)    D)    E)   " class="answers-bank-image d-inline" rel="preload" > HPO42  H2O 3PO4  H2O   H2PO4  H3O   H2PO4  H2O   HPO42  H3O   HPO42  H2O   PO43  H3O   What is the Kb expression for the base, sodium phosphate? A)    B)    C)    D)    E)   " class="answers-bank-image d-inline" rel="preload" > PO43  H3O 3PO4  H2O   H2PO4  H3O   H2PO4  H2O   HPO42  H3O   HPO42  H2O   PO43  H3O   What is the Kb expression for the base, sodium phosphate? A)    B)    C)    D)    E)   " class="answers-bank-image d-inline" rel="preload" > What is the Kb expression for the base, sodium phosphate?

Accepted Answer

A)   3PO4  H2O   H2PO4  H3O   H2PO4  H2O   HPO42  H3O   HPO42  H2O   PO43  H3O   What is the Kb expression for the base, sodium phosphate? 
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >
B)   3PO4  H2O   H2PO4  H3O   H2PO4  H2O   HPO42  H3O   HPO42  H2O   PO43  H3O   What is the Kb expression for the base, sodium phosphate? 
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >
C)   3PO4  H2O   H2PO4  H3O   H2PO4  H2O   HPO42  H3O   HPO42  H2O   PO43  H3O   What is the Kb expression for the base, sodium phosphate? 
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >
D)   3PO4  H2O   H2PO4  H3O   H2PO4  H2O   HPO42  H3O   HPO42  H2O   PO43  H3O   What is the Kb expression for the base, sodium phosphate? 
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >
E)   3PO4  H2O   H2PO4  H3O   H2PO4  H2O   HPO42  H3O   HPO42  H2O   PO43  H3O   What is the Kb expression for the base, sodium phosphate? 
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >

Question 7

Which one A-D is not related to the water autoionization constant, Kw?

Accepted Answer

A)  [H3O] [OH]
B)  1.0  1014 at 25C
C)  2 H2O w? 
A)  [H3O] [OH] 
B)  1.0  1014 at 25C 
C)  2 H2O   H3O  OH 
D)  pH  7 at 25C 
E)  A-D are all related to Kw." class="answers-bank-image d-inline" rel="preload" > H3O  OH
D)  pH  7 at 25C
E)  A-D are all related to Kw.

Question 8

The degree of ionization ________

Accepted Answer

A)  increases with increasing concentration of a weak acid.
B)  decreases with increasing concentration of a weak acid.
C)  does not change with changing concentration of a weak acid.
D)  is not related to the concentration of a weak acid.
E)  is independent of the composition of the weak acid.

Question 9

Three common weak bases are phosphate (P; PO43, pKb  1.3) , carbonate (C; CO32, pKb  3.7) , and acetate (A; CH3COO, pKb  9.3) . Which response has these bases listed in order of increasing strength?

Accepted Answer

A)  P  C  A
B)  C  P  A
C)  A  C  P
D)  C  A  P
E)  P  A  C

Question 10

Which one of the following is not a conjugate acid-base pair?

Accepted Answer

A)  NH3 and NH4
B)  H3O and OH
C)  H2PO4 and HPO42
D)  HS and H2S
E)  NH3 and NH2

Question 11

Lactic acid is a major component of Ringer's solution, which is used as an intravenous fluid to maintain fluid balance in trauma patients. The pH of a 0.100 M lactic acid solution is around 2.44. Based on this information, determine the value of the acid ionization constant, Ka, for lactic acid.

Accepted Answer

1.4 F1F1F1...

Question 12

Sometimes liquid ammonia, NH3, is used as a solvent rather than water. Which expression defines the ammonia autoionization counterpart of Kw?

Accepted Answer

A)  [H3O][OH]
B)  [NH3][NH4]
C)  [NH2][NH4]
D)  [H3O][NH2]
E)  [NH4][OH]

Question 13

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  OA

Question 14

Ammonia (NH3)  acts as a weak base in aqueous solution. What is the acid that reacts with this base when ammonia is dissolved in water?

Accepted Answer

A)  None, there are no acids in pure water.
B)  H2O
C)  NH4
D)  trick question, because no acids are present, ammonia cannot act as a base
E)  oxygen that always is dissolved in water

Question 15

Boric acid frequently is used as an eyewash to treat eye infections. The pH of a 0.050 M solution of boric acid is 5.28. What is the value of the boric acid ionization constant, Ka?

Accepted Answer

A)  5.25  106
B)  5.51  1010
C)  5.43  108
D)  5.79  104
E)  5.33  1012

Question 16

Identify the weakest and strongest acids in the group below. The weakest acid is listed first in the responses. CH4, SiH4, SnH4

Accepted Answer

A)  CH4  SiH4
B)  CH4  SnH4
C)  SiH4  SnH4
D)  SiH4  SnH4.
E)  SnH4  CH4

Question 17

Explain why some salts produce neutral solutions while others produce solutions that are acidic or basic, and give an example for each.

Accepted Answer

Acidic solutions are produced if the cat...

Question 18

Magnesium sulfate can be obtained at a drugstore as Epsom salts. The monohydrate is found as the mineral kieserite (MgSO4  H2O, 138 g/mol) . What would be the pH of a 500 mL aqueous solution containing 1.62 g of dissolved kieserite? The 4  H2O, 138 g/mol) . What would be the pH of a 500 mL aqueous solution containing 1.62 g of dissolved kieserite? The   value for sulfuric acid is 1.2  102. A) 7.00 B) 6.85 C) 7.15 D) 3.55 E) 12.22" class="answers-bank-image d-inline" rel="preload" > value for sulfuric acid is 1.2  102.

Accepted Answer

A)  7.00
B)  6.85
C)  7.15
D)  3.55
E)  12.22

Question 19

Which one of the following salts forms aqueous solutions with pH  7?

Accepted Answer

A)  Na2S
B)  NaBr
C)  NaClO2
D)  NaNO2
E)  Na2CO3

Question 20

In the following reaction in aqueous solution, the acid reactant is ________ and its conjugate base product is ________. CH3COOH  NH3 3COOH  NH3   CH3COO  NH4 A) CH3COOH; CH3COO B) CH3COOH; NH4 C) NH3; CH3COO D) NH3; NH4 E) CH3COOH; H3O" class="answers-bank-image d-inline" rel="preload" > CH3COO  NH4

Accepted Answer

A)  CH3COOH; CH3COO
B)  CH3COOH; NH4
C)  NH3; CH3COO
D)  NH3; NH4
E)  CH3COOH; H3O

Exam 15: Acidbase Equilibria: Proton Transfer in Biological Systems

In the following reaction in aqueous solution, the acid reactant is ________ and its conjugate base product is ________. CH3COOH  NH3 CH3COO  NH4

Correct AnswerverifiedShow Answer

Sometimes liquid ammonia, NH3, is used as a solvent rather than water. Which expression defines the ammonia autoionization counterpart of Kw?

Correct AnswerverifiedShow Answer

The degree of ionization ________

Correct AnswerverifiedShow Answer

Which one of the following salts forms aqueous solutions with pH  7?

Correct AnswerverifiedShow Answer

Which statement A-D is not correct? Pure water at 25C has ________

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

What is the concentration of the acetate ion in a 1.00 M CH3COOH solution given that the Ka of CH3COOH is 1.8  105?

Correct Answerverified4.20 F1F1F...View AnswerShow Answer

Which one of the following is not a conjugate acid-base pair?

Correct AnswerverifiedShow Answer

Define a conjugate acidbase pair and provide an example.

Correct AnswerverifiedA conjugate acidF1F1F...View AnswerShow Answer

Boric acid frequently is used as an eyewash to treat eye infections. The pH of a 0.050 M solution of boric acid is 5.28. What is the value of the boric acid ionization constant, Ka?

Correct AnswerverifiedShow Answer

Magnesium sulfate can be obtained at a drugstore as Epsom salts. The monohydrate is found as the mineral kieserite (MgSO4  H2O, 138 g/mol) . What would be the pH of a 500 mL aqueous solution containing 1.62 g of dissolved kieserite? The value for sulfuric acid is 1.2  102.

Correct AnswerverifiedShow Answer

Ammonia (NH3) acts as a weak base in aqueous solution. What is the acid that reacts with this base when ammonia is dissolved in water?

Correct AnswerverifiedShow Answer

Three common weak bases are phosphate (P; PO43, pKb  1.3) , carbonate (C; CO32, pKb  3.7) , and acetate (A; CH3COO, pKb  9.3) . Which response has these bases listed in order of increasing strength?

Correct AnswerverifiedShow Answer

Identify the weakest and strongest acids in the group below. The weakest acid is listed first in the responses. CH4, SiH4, SnH4

Correct AnswerverifiedShow Answer

Lactic acid is a major component of Ringer's solution, which is used as an intravenous fluid to maintain fluid balance in trauma patients. The pH of a 0.100 M lactic acid solution is around 2.44. Based on this information, determine the value of the acid ionization constant, Ka, for lactic acid.

Correct Answerverified1.4 F1F1F1...View AnswerShow Answer

Which one A-D is not related to the water autoionization constant, Kw?

Correct AnswerverifiedShow Answer

When [H]  4.0  109 M in water at 25C, then ________

Correct AnswerverifiedShow Answer

Write the reaction and equilibrium constant that describes the autoionization of water.

Correct AnswerverifiedShow Answer

Explain why some salts produce neutral solutions while others produce solutions that are acidic or basic, and give an example for each.

Correct AnswerverifiedAcidic solutions are produced if the cat...View AnswerShow Answer

Phosphoric acid is a triprotic acid, ionizing in the following sequential steps: H3PO4  H2O H2PO4  H3O H2PO4  H2O HPO42  H3O HPO42  H2O PO43  H3O What is the Kb expression for the base, sodium phosphate?

Correct AnswerverifiedShow Answer

In the following reaction in aqueous solution, the acid reactant is and its conjugate base product is . CH₃COOH  NH₃ CH₃COO^  NH₄^

Correct Answer
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Sometimes liquid ammonia, NH₃, is used as a solvent rather than water. Which expression defines the ammonia autoionization counterpart of K_w?

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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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
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What is the concentration of the acetate ion in a 1.00 M CH₃COOH solution given that the K_a of CH₃COOH is 1.8  10^⁵?

Correct Answer
verified
4.20 F1F1F...
View Answer

Correct Answer
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Correct Answer
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A conjugate acidF1F1F...
View Answer

Boric acid frequently is used as an eyewash to treat eye infections. The pH of a 0.050 M solution of boric acid is 5.28. What is the value of the boric acid ionization constant, K_a?

Correct Answer
verified

Magnesium sulfate can be obtained at a drugstore as Epsom salts. The monohydrate is found as the mineral kieserite (MgSO₄  H₂O, 138 g/mol) . What would be the pH of a 500 mL aqueous solution containing 1.62 g of dissolved kieserite? The value for sulfuric acid is 1.2  10^².

Correct Answer
verified

Ammonia (NH₃) acts as a weak base in aqueous solution. What is the acid that reacts with this base when ammonia is dissolved in water?

Correct Answer
verified

Three common weak bases are phosphate (P; PO₄³^, pK_b  1.3) , carbonate (C; CO₃²^, pK_b  3.7) , and acetate (A; CH₃COO^, pK_b  9.3) . Which response has these bases listed in order of increasing strength?

Correct Answer
verified

Identify the weakest and strongest acids in the group below. The weakest acid is listed first in the responses. CH₄, SiH₄, SnH₄

Correct Answer
verified

Lactic acid is a major component of Ringer's solution, which is used as an intravenous fluid to maintain fluid balance in trauma patients. The pH of a 0.100 M lactic acid solution is around 2.44. Based on this information, determine the value of the acid ionization constant, K_a, for lactic acid.

Correct Answer
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1.4 F1F1F1...
View Answer

Which one A-D is not related to the water autoionization constant, K_w?

Correct Answer
verified

When [H^]  4.0  10^⁹ M in water at 25C, then ________

Correct Answer
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Correct Answer
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Correct Answer
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Acidic solutions are produced if the cat...
View Answer

Phosphoric acid is a triprotic acid, ionizing in the following sequential steps: H₃PO₄  H₂O H₂PO₄^  H₃O^ H₂PO₄^  H₂O HPO₄²^  H₃O^ HPO₄²^  H₂O PO₄³^  H₃O^ What is the K_b expression for the base, sodium phosphate?

Correct Answer
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