Question 1

A buffer is prepared by adding 150 mL of 1.0 M NaOH to 250 mL of 1.0 M NaH2PO4.How many moles of HCl must be added to this buffer solution to change the pH by 0.18 units?

Accepted Answer

A)  0.025 mol HCl
B)  0.063 mol HCl
C)  0.082 mol HCl
D)  0.50 mol HCl
E)  1.0 mol HClF) A) and D)
G) B) and C)

Question 2

A solution is prepared by adding 500 mL of 0.3 M NaClO to 500 mL of 0.4 M HClO.What is the pH of this solution?

Accepted Answer

A)  The pH will be greater than the pKa of hypochlorous acid.
B)  The pH will be less than the pKa of hypochlorous acid.
C)  The pH will be equal to the pKa of hypochlorous acid.
D)  The pH will equal the pKb of sodium hypochlorite.
E)  The pH will be none of these.F) D) and E)
G) B) and D)

Question 3

What is the [H3O+] in a solution that consists of 1.5 M NH3 and 2.5 NH4Cl?
Kb = 1.8  ×	imes×  10-5

Accepted Answer

A)  1.1  ×	imes×  10-5 M
B)  3.0  ×	imes×  10-6 M
C)  3.3  ×	imes×  10-9 M
D)  9.3  ×	imes×  10-10 M
E)  None of these choices is correct. F) All of the above
G) C) and D)

Question 4

The solubility of aluminum hydroxide in water ______________ when dilute nitric acid is added to it.

Accepted Answer

A)  increases
B)  decreases
C)  does not change
D)  first increases,then decreases
E)  first decreases,then increasesF) A) and B)
G) B) and D)

Question 5

What is the [H3O+] in a buffer that consists of 0.30 M HCOOH and 0.20 M HCOONa?
Ka = 1.7  ×	imes×  10-4

Accepted Answer

A)  1.1  ×	imes×  10-4 M
B)  2.6  ×	imes×  10-4 M
C)  4.3  ×	imes×  10-4 M
D)  6.7  ×	imes×  10-5 M
E)  None of these choices is correct. F) A) and E)
G) A) and C)

Question 6

Calculate the solubility of silver phosphate,Ag3PO4,in pure water.Ksp = 2.6  ×	imes×  10-18

Accepted Answer

A)  4.0  ×	imes×  10-5 M
B)  1.8  ×	imes×  10-5 M
C)  4.0  ×	imes×  10-6 M
D)  1.5  ×	imes×  10-6 M
E)  ×	imes×  10-6 M F) B) and D)
G) C) and E)

Question 7

A 25.0-mL sample of 0.10 M C2H3NH2 (ethylamine) is titrated with 0.15 M HCl.What is the pH of the solution after 9.00 mL of acid have been added to the amine?
Kb = 6.5  ×	imes×  10-4

Accepted Answer

A)  11.08
B)  10.88
C)  10.74
D)  10.55
E)  10.49 F) A) and C)
G) A) and E)

Question 8

What volume of 0.500 M H2SO4 is needed to react completely with 20.0 mL of 0.400 M LiOH?

Accepted Answer

A)  4.00 mL
B)  8.00 mL
C)  12.5 mL
D)  16.0 mL
E)  32.0 mLF) A) and E)
G) A) and D)

Question 9

What is the maximum amount of sodium sulfate that can be added to 1.00 L of 0.0020 M Ca(NO3) 2 before precipitation of calcium sulfate begins? Ksp = 2.4  ×	imes×  10-5 for calcium sulfate

Accepted Answer

A)  1.2  ×	imes×  10-2 mol
B)  4.9  ×	imes×  10-3 mol
C)  3.5  ×	imes×  10-3 mol
D)  1.2  ×	imes×  10-5 mol
E)  4.8  ×	imes×  10-8 mol F) A) and E)
G) All of the above

Question 10

Which one of the following aqueous solutions,when mixed with an equal volume of 0.10 mol L-1 aqueous NH3,will produce a buffer solution?

Accepted Answer

A)  0.10 mol L-1 HCl
B)  0.20 mol L-1 HCl
C)  0.10 mol L-1 CH3COOH
D)  0.050 mol L-1 NaOH
E)  0.20 mol L-1 NH4ClF) A) and B)
G) C) and D)

Question 11

The solubility of silver chromate is 0.0287 g/1.0 L of solution.What is the Ksp for Ag2CrO4?

Accepted Answer

A)  9.5  ×	imes×  10-5
B)  2.4  ×	imes×  10-5
C)  2.6  ×	imes×  10-12
D)  6.5  ×	imes×  10-13
E)  ×	imes×  10-13 F) None of the above
G) C) and E)

Question 12

Lead(II)iodide,PbI2,is an ionic compound with a solubility product constant Ksp of 7.9 $\times$ 10-9.Calculate the solubility of this compound in
a.pure water.
b.0.50 mol L-1 KI solution.

Accepted Answer

a.1.3 <img  loading="lazy" src="/assets/images/blured-textbook.svg" class="d-inline m-1" alt="blured image" width="139" height="30"> 10<sup>-3</su...

Question 13

Increasing the concentrations of the components of a buffer solution will increase the buffer capacity.

Accepted Answer

A) True 
 B)False

Question 14

Which one of the following pairs of 0.100 mol L-1 solutions,when mixed,will produce a buffer solution?

Accepted Answer

A)  50.mL of aqueous CH3COOH and 25.mL of aqueous HCl
B)  50.mL of aqueous CH3COOH and 100.mL of aqueous NaOH
C)  50.mL of aqueous NaOH and 25.mL of aqueous HCl
D)  50.mL of aqueous CH3COONa and 25.mL of aqueous NaOH
E)  50.mL of aqueous CH3COOH and 25.mL of aqueous CH3COONaF) B) and C)
G) B) and D)

Question 15

What is the pH of 375 mL of solution containing 0.150 mol of propenoic acid (HA)and 0.250 mol of sodium propenoate (NaA)? (Ka for propenoic acid is 5.52 $\times$ 10-5. )

Accepted Answer

The answer of What is the pH of 375 mL...

Question 16

Hydrochloric acid (0.100 mol L-1,25.00 mL aliquot)is being titrated with sodium hydroxide of the same molarity.Calculate the solution pH after addition of 24.80 mL of the sodium hydroxide.Make any reasonable approximations.

Accepted Answer

Question 17

An acetate buffer has a pH of 4.40.Which of the following changes will cause the pH to decrease?

Accepted Answer

A)  dissolving a small amount of solid sodium acetate
B)  adding a small amount of dilute hydrochloric acid
C)  adding a small amount of dilute sodium hydroxide
D)  dissolving a small amount of solid sodium chloride
E)  diluting the buffer solution with waterF) A) and D)
G) A) and B)

Question 18

The solubility of magnesium phosphate is 2.27  ×	imes×  10-3 g/1.0 L of solution.What is the Ksp for Mg3(PO4) 2?

Accepted Answer

A)  6.5  ×	imes×  10-12
B)  6.0  ×	imes×  10-14
C)  5.2  ×	imes×  10-24
D)  4.8  ×	imes×  10-26
E)  1.0  ×	imes×  10-26 F) A) and B)
G) A) and C)

Question 19

What is the pH of a solution that consists of 0.50 M H2C6H6O6 (ascorbic acid) and 0.75 M NaHC6H6O6 (sodium ascorbate) ?
Ka = 6.8  ×	imes×  10-5

Accepted Answer

A)  3.76
B)  3.99
C)  4.34
D)  4.57
E)  5.66 F) A) and E)
G) A) and D)

Question 20

Write the ion product expression for calcium phosphate,Ca3(PO4) 2.

Accepted Answer

A)  3(PO4) 2. 
A)     
B)     
C)     
D)     
E)  None of these is the correct ion product expression." class="answers-bank-image d-inline" rel="preload" >
B)  3(PO4) 2. 
A)     
B)     
C)     
D)     
E)  None of these is the correct ion product expression." class="answers-bank-image d-inline" rel="preload" >
C)  3(PO4) 2. 
A)     
B)     
C)     
D)     
E)  None of these is the correct ion product expression." class="answers-bank-image d-inline" rel="preload" >
D)  3(PO4) 2. 
A)     
B)     
C)     
D)     
E)  None of these is the correct ion product expression." class="answers-bank-image d-inline" rel="preload" >
E)  None of these is the correct ion product expression.F) C) and D)
G) A) and B)

Exam 19: Ionic Equilibria in Aqueous Systems

A buffer is prepared by adding 150 mL of 1.0 M NaOH to 250 mL of 1.0 M NaH2PO4.How many moles of HCl must be added to this buffer solution to change the pH by 0.18 units?

Correct AnswerverifiedShow Answer

Lead(II)iodide,PbI2,is an ionic compound with a solubility product constant Ksp of 7.9 ×\times× 10-9.Calculate the solubility of this compound in a.pure water. b.0.50 mol L-1 KI solution.

Correct Answerverifieda.1.3 10-3View AnswerShow Answer

A 25.0-mL sample of 0.10 M C2H3NH2 (ethylamine) is titrated with 0.15 M HCl.What is the pH of the solution after 9.00 mL of acid have been added to the amine? Kb = 6.5 ×\times× 10-4

Correct AnswerverifiedShow Answer

The solubility of silver chromate is 0.0287 g/1.0 L of solution.What is the Ksp for Ag2CrO4?

Correct AnswerverifiedShow Answer

Write the ion product expression for calcium phosphate,Ca3(PO4) 2.

Correct AnswerverifiedShow Answer

What is the [H3O+] in a buffer that consists of 0.30 M HCOOH and 0.20 M HCOONa? Ka = 1.7 ×\times× 10-4

Correct AnswerverifiedShow Answer

Hydrochloric acid (0.100 mol L-1,25.00 mL aliquot)is being titrated with sodium hydroxide of the same molarity.Calculate the solution pH after addition of 24.80 mL of the sodium hydroxide.Make any reasonable approximations.

Correct AnswerverifiedShow Answer

A solution is prepared by adding 500 mL of 0.3 M NaClO to 500 mL of 0.4 M HClO.What is the pH of this solution?

Correct AnswerverifiedShow Answer

Which one of the following pairs of 0.100 mol L-1 solutions,when mixed,will produce a buffer solution?

Correct AnswerverifiedShow Answer

An acetate buffer has a pH of 4.40.Which of the following changes will cause the pH to decrease?

Correct AnswerverifiedShow Answer

What is the [H3O+] in a solution that consists of 1.5 M NH3 and 2.5 NH4Cl? Kb = 1.8 ×\times× 10-5

Correct AnswerverifiedShow Answer

Which one of the following aqueous solutions,when mixed with an equal volume of 0.10 mol L-1 aqueous NH3,will produce a buffer solution?

Correct AnswerverifiedShow Answer

The solubility of aluminum hydroxide in water ______________ when dilute nitric acid is added to it.

Correct AnswerverifiedShow Answer

Calculate the solubility of silver phosphate,Ag3PO4,in pure water.Ksp = 2.6 ×\times× 10-18

Correct AnswerverifiedShow Answer

What is the maximum amount of sodium sulfate that can be added to 1.00 L of 0.0020 M Ca(NO3) 2 before precipitation of calcium sulfate begins? Ksp = 2.4 ×\times× 10-5 for calcium sulfate

Correct AnswerverifiedShow Answer

What volume of 0.500 M H2SO4 is needed to react completely with 20.0 mL of 0.400 M LiOH?

Correct AnswerverifiedShow Answer

What is the pH of 375 mL of solution containing 0.150 mol of propenoic acid (HA)and 0.250 mol of sodium propenoate (NaA)? (Ka for propenoic acid is 5.52 ×\times× 10-5. )

Correct AnswerverifiedShow Answer

Increasing the concentrations of the components of a buffer solution will increase the buffer capacity.

Correct AnswerverifiedShow Answer

What is the pH of a solution that consists of 0.50 M H2C6H6O6 (ascorbic acid) and 0.75 M NaHC6H6O6 (sodium ascorbate) ? Ka = 6.8 ×\times× 10-5

Correct AnswerverifiedShow Answer

The solubility of magnesium phosphate is 2.27 ×\times× 10-3 g/1.0 L of solution.What is the Ksp for Mg3(PO4) 2?

Correct AnswerverifiedShow Answer

A buffer is prepared by adding 150 mL of 1.0 M NaOH to 250 mL of 1.0 M NaH₂PO₄.How many moles of HCl must be added to this buffer solution to change the pH by 0.18 units?

Correct Answer
verified

Lead(II)iodide,PbI₂,is an ionic compound with a solubility product constant K_sp of 7.9 $\times$ 10^-⁹.Calculate the solubility of this compound in a.pure water. b.0.50 mol L^-1 KI solution.

Correct Answer
verified
a.1.3 10^{-3View Answer}

A 25.0-mL sample of 0.10 M C₂H₃NH₂ (ethylamine) is titrated with 0.15 M HCl.What is the pH of the solution after 9.00 mL of acid have been added to the amine? K_b = 6.5 $\times$ 10^-4

Correct Answer
verified

The solubility of silver chromate is 0.0287 g/1.0 L of solution.What is the K_sp for Ag₂CrO₄?

Correct Answer
verified

Write the ion product expression for calcium phosphate,Ca₃(PO₄) ₂.

Correct Answer
verified

What is the [H₃O⁺] in a buffer that consists of 0.30 M HCOOH and 0.20 M HCOONa? K_a = 1.7 $\times$ 10^-4

Correct Answer
verified

Hydrochloric acid (0.100 mol L^-1,25.00 mL aliquot)is being titrated with sodium hydroxide of the same molarity.Calculate the solution pH after addition of 24.80 mL of the sodium hydroxide.Make any reasonable approximations.

Correct Answer
verified

Correct Answer
verified

Which one of the following pairs of 0.100 mol L^-1 solutions,when mixed,will produce a buffer solution?

Correct Answer
verified

Correct Answer
verified

What is the [H₃O⁺] in a solution that consists of 1.5 M NH₃ and 2.5 NH₄Cl? K_b = 1.8 $\times$ 10^-5

Correct Answer
verified

Which one of the following aqueous solutions,when mixed with an equal volume of 0.10 mol L^-1 aqueous NH₃,will produce a buffer solution?

Correct Answer
verified

Correct Answer
verified

Calculate the solubility of silver phosphate,Ag₃PO₄,in pure water.K_sp = 2.6 $\times$ 10^-18

Correct Answer
verified

What is the maximum amount of sodium sulfate that can be added to 1.00 L of 0.0020 M Ca(NO₃) ₂ before precipitation of calcium sulfate begins? K_sp = 2.4 $\times$ 10^-5 for calcium sulfate

Correct Answer
verified

What volume of 0.500 M H₂SO₄ is needed to react completely with 20.0 mL of 0.400 M LiOH?

Correct Answer
verified

What is the pH of 375 mL of solution containing 0.150 mol of propenoic acid (HA)and 0.250 mol of sodium propenoate (NaA)? (K_a for propenoic acid is 5.52 $\times$ 10^-5. )

Correct Answer
verified

Correct Answer
verified

What is the pH of a solution that consists of 0.50 M H₂C₆H₆O₆ (ascorbic acid) and 0.75 M NaHC₆H₆O₆ (sodium ascorbate) ? K_a = 6.8 $\times$ 10^-5

Correct Answer
verified

The solubility of magnesium phosphate is 2.27 $\times$ 10^-3 g/1.0 L of solution.What is the K_sp for Mg₃(PO₄) ₂?

Correct Answer
verified