Question 1

Which statement below is NOT correct for the pH of a 0.01 M NaCl solution versus the pH of a 0.01 M in FeSO4 solution?

Accepted Answer

A)  The activity coefficient for H+ will be larger in 0.01 M NaCl than in 0.01 M FeSO4.
B)  The activity coefficient for OH− will be larger in 0.01 M NaCl than in 0.01 M FeSO4.
C)  The hydronium concentration in 0.01 M NaCl will equal the hydronium concentration in 0.01 M FeSO4.
D)  The H+ activity in 0.01 M NaCl will not equal the H+ activity in 0.01 M FeSO4.
E)  The OH− activity in 0.01 M NaCl will not equal the OH− activity in 0.01 M FeSO4.

Question 2

What is the ionic strength of a 2:1 electrolyte with a concentration of 0.100 M?

Accepted Answer

A)  0) 100
B)  0) 200
C)  0) 300
D)  0) 400
E)  0) 500

Question 3

Calculate the activity coefficient for Fe2+ for an ionic strength of 0.034 M.For F1F1F1S1F1F1F10 = 0.01 M,F1F1F1S1F1F1F10 = 0.675 and for F1F1F1S1F1F1F10 = 0.05 M,F1F1F1S1F1F1F10 = 0.485.

Accepted Answer

<font face="symbol"></font> = 0...

Question 4

Calculate the pOH of a 0.010 M HCl solution with an ionic strength of 0.10 M.H+ = 0.83,OH− = 0.76.

Accepted Answer

A)  11.92
B)  11.80
C)  11.88
D)  12.00
E)  12.20

Question 5

Calculate the pH of a 0.001 M HCN solution.Ka = 6.2 × 10−10

Accepted Answer

Question 6

Which statement below is INCORRECT for the increased solubility of a sparingly soluble salt,AgCl,in an inert salt solution,NaNO3?

Accepted Answer

A)  The ionic atmosphere around the silver cations becomes increasingly negative as the nitrate anions are attracted to the silver cations.
B)  The ionic strength around the chloride anions becomes increasingly positive as the sodium cations are attracted to the chloride anions.
C)  The ionic atmosphere increases the attraction between silver cations and chloride anions,increasing solubility by creating more AgCl (aq) in solution.
D)  Ions continually diffuse into and out of the ionic atmosphere.
E)  The negative ionic atmosphere around silver cations results in an overall positive charge less than the positive charge of the silver cations.

Question 7

Calculate the pH of a 0.002 M (CH3)3N solution.Kb = 6.6 × 10−5

Accepted Answer

Question 8

Which of the statements below are INCORRECT for mass balance and charge balance?
I The mass balance is a statement of the conservation of matter.
II Mass balance is satisfied when the quantity of all species in a solution containing a particular atom (or group of atoms) equals the amount of that atom (or group) reacted.
III The sum of the positive charges in solution equals the sum of the negative charges in solution.
IV The coefficient in front of each species in a charge balance always equals the magnitude of the charge on the counter ion.

Accepted Answer

A)  I,II,III and IV
B)  I,III and IV
C)  I,II and III
D)  I and IV
E)  II and III

Question 9

Calculate the pH of a 0.010 M CH3CO2H solution.Ka = 1.8 × 10−5 for acetic acid.

Accepted Answer

A)  9) 26
B)  3) 39
C)  2) 02
D)  10.61
E)  4) 74

Question 10

Calculate the ionic strength of a 0.210 M FeCl2 solution.

Accepted Answer

0.630

Question 11

Which equation is NOT required to determine the molar solubility of AgCN?

Accepted Answer

A)  AgCN ⇋ Ag+ + CN−____________________Ksp = 2.2 × 10−16
B)  H2O + H2O ⇋ H3O+ + OH− Kw = 1 × 10−14
C)  [Ag+] = [CN−] + [HCN]
D)  CN− + H2O ⇋ HCN + OH− Kb = 1.6 × 10−5
E)  HCN + H2O ⇋ CN− + H3O+ Ka = 6.2 × 10−10

Question 12

Calculate the pH of a 0.040 M HCl solution that is also 0.010 M in NaNO3.

Accepted Answer

pH = 1.46 This problem requires Table 8.1 for the students to look up the activity coefficients for H⁺ and Cl⁻.F1F1F1S1F1F1F10_H+ = 0.86,F1F1F1S1F1F1F10_Cl₋ = F1F1F1S1F1F1F10_NO₃₋ = 0.805 and F1F1F1S1F1F1F10_Na+ = 0.82 when F1F1F1S1F1F1F10 = 0.05 M. Since HCl is a strong base,the hydronium concentration is 0.04.Calculate the pH using the activity coefficient for H⁺. 8-5 Applying the Systematic Treatment of Equilibrium

Question 13

For Ag+ when  = 0.01 M, = 0.898 and when  = 0.05, = 0.80.What is the activity coefficient when  = 0.024 M?

Accepted Answer

A)  0) 804
B)  0) 845
C)  0) 853
D)  0) 864
E)  0) 894

Question 14

Which equation is NOT required to determine the pH of 0.10 M solution of weak acid,HA?

Accepted Answer

A)  HA + H2O ⇋ A− + H3O+ Ka = 2.4 × 10−6
B)  H2O + H2O ⇋ H3O+ + OH− Kw = 1 × 10−14
C)  0) 10 = [HA] + [A−]
D)  [H3O+] = [OH−] + [A−]
E)  A− + H2O ⇋ HA + OH− Kb = 4.2 × 10−9

Question 15

To correct for the effect of ionic strength on chemical reactions,concentrations are replaced by____________________ in equilibrium expressions.

Accepted Answer

A)  activity coefficients
B)  ion activities
C)  molecular activities
D)  activities
E)  active strength

Question 16

Which of the following is NOT true for pH?

Accepted Answer

A)  pH = −log[H+]H+.
B)  pH = −log[H+] when  = 0.
C)  The pH = pOH for pure water.
D)  As ionic strength increases,so does the pH of pure water.
E)  The ionic strength of pure water is 1.0 x 10−7 M.

Question 17

____________________ is a measure of the total concentration of ions in solution.

Accepted Answer

A)  Ionic radius
B)  Ionic density
C)  Ionic degree
D)  Ionic strength
E)  Ionic atmosphere

Question 18

All of the following are TRUE for activities and activity coefficients,except:

Accepted Answer

A)  activity for a chemical species is the product of concentration and activity coefficient.
B)  the activity coefficient corrects for non-ideal behavior due to ionic strength.
C)  as ionic strength increases,the value of the activity coefficient increases.
D)  for ions,the activity coefficient approaches unity as the ionic strength approaches 0.
E)  the activity coefficient for neutral molecules is approximately unity when the ionic strength is less than 0.1 M. C

Question 19

The mass balance equation for a 0.10 M HO2CCO2H solution is which of the following?

Accepted Answer

A)  2CCO2H solution is which of the following?  
A)    
B)    
C)    
D)    
E)   " class="answers-bank-image d-inline" rel="preload" >
B)  2CCO2H solution is which of the following?  
A)    
B)    
C)    
D)    
E)   " class="answers-bank-image d-inline" rel="preload" >
C)  2CCO2H solution is which of the following?  
A)    
B)    
C)    
D)    
E)   " class="answers-bank-image d-inline" rel="preload" >
D)  2CCO2H solution is which of the following?  
A)    
B)    
C)    
D)    
E)   " class="answers-bank-image d-inline" rel="preload" >
E)  2CCO2H solution is which of the following?  
A)    
B)    
C)    
D)    
E)   " class="answers-bank-image d-inline" rel="preload" >

Question 20

A buffer is prepared from NaH2PO4 and Na2HPO4.The charge balance equation for the buffer is which of the following?

Accepted Answer

A)  2PO4 and Na2HPO4.The charge balance equation for the buffer is which of the following? 
A)    
B)    
C)    
D)    
E)    " class="answers-bank-image d-inline" rel="preload" >
B)  2PO4 and Na2HPO4.The charge balance equation for the buffer is which of the following? 
A)    
B)    
C)    
D)    
E)    " class="answers-bank-image d-inline" rel="preload" >
C)  2PO4 and Na2HPO4.The charge balance equation for the buffer is which of the following? 
A)    
B)    
C)    
D)    
E)    " class="answers-bank-image d-inline" rel="preload" >
D)  2PO4 and Na2HPO4.The charge balance equation for the buffer is which of the following? 
A)    
B)    
C)    
D)    
E)    " class="answers-bank-image d-inline" rel="preload" >
E)  2PO4 and Na2HPO4.The charge balance equation for the buffer is which of the following? 
A)    
B)    
C)    
D)    
E)    " class="answers-bank-image d-inline" rel="preload" >

Exam 9: Activity and the Systematic Treatment of Equilibrium

Which statement below is NOT correct for the pH of a 0.01 M NaCl solution versus the pH of a 0.01 M in FeSO₄ solution?

Correct Answer
verified

What is the ionic strength of a 2:1 electrolyte with a concentration of 0.100 M?

Correct Answer
verified

Calculate the activity coefficient for Fe²⁺ for an ionic strength of 0.034 M.For  = 0.01 M, = 0.675 and for  = 0.05 M, = 0.485.

Correct Answer
verified
 = 0...
View Answer

Calculate the pOH of a 0.010 M HCl solution with an ionic strength of 0.10 M._H+ = 0.83,_OH₋ = 0.76.

Correct Answer
verified

Calculate the pH of a 0.001 M HCN solution.K_a = 6.2 × 10⁻¹⁰

Correct Answer
verified

Which statement below is INCORRECT for the increased solubility of a sparingly soluble salt,AgCl,in an inert salt solution,NaNO₃?

Correct Answer
verified

Calculate the pH of a 0.002 M (CH₃)₃N solution.K_b = 6.6 × 10⁻⁵

Correct Answer
verified

Correct Answer
verified

Calculate the pH of a 0.010 M CH₃CO₂H solution.K_a = 1.8 × 10−⁵ for acetic acid.

Correct Answer
verified

Calculate the ionic strength of a 0.210 M FeCl₂ solution.

Correct Answer
verified
0.630

Which equation is NOT required to determine the molar solubility of AgCN?

Correct Answer
verified

Calculate the pH of a 0.040 M HCl solution that is also 0.010 M in NaNO₃.

For Ag⁺ when  = 0.01 M, = 0.898 and when  = 0.05, = 0.80.What is the activity coefficient when  = 0.024 M?

Correct Answer
verified

Which equation is NOT required to determine the pH of 0.10 M solution of weak acid,HA?

Correct Answer
verified

To correct for the effect of ionic strength on chemical reactions,concentrations are replaced by____________________ in equilibrium expressions.

Correct Answer
verified

Which of the following is NOT true for pH?

Correct Answer
verified

____________________ is a measure of the total concentration of ions in solution.

Correct Answer
verified

All of the following are TRUE for activities and activity coefficients,except:

Correct Answer
verified
C

The mass balance equation for a 0.10 M HO₂CCO₂H solution is which of the following?

Correct Answer
verified

A buffer is prepared from NaH₂PO₄ and Na₂HPO₄.The charge balance equation for the buffer is which of the following?

Correct Answer
verified

Exam 9: Activity and the Systematic Treatment of Equilibrium

Which statement below is NOT correct for the pH of a 0.01 M NaCl solution versus the pH of a 0.01 M in FeSO4 solution?

Correct AnswerverifiedShow Answer

What is the ionic strength of a 2:1 electrolyte with a concentration of 0.100 M?

Correct AnswerverifiedShow Answer

Calculate the activity coefficient for Fe2+ for an ionic strength of 0.034 M.For  = 0.01 M, = 0.675 and for  = 0.05 M, = 0.485.

Correct Answerverified = 0...View AnswerShow Answer

Calculate the pOH of a 0.010 M HCl solution with an ionic strength of 0.10 M.H+ = 0.83,OH− = 0.76.

Correct AnswerverifiedShow Answer

Calculate the pH of a 0.001 M HCN solution.Ka = 6.2 × 10−10

Correct AnswerverifiedShow Answer

Which statement below is INCORRECT for the increased solubility of a sparingly soluble salt,AgCl,in an inert salt solution,NaNO3?

Correct AnswerverifiedShow Answer

Calculate the pH of a 0.002 M (CH3)3N solution.Kb = 6.6 × 10−5

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Calculate the pH of a 0.010 M CH3CO2H solution.Ka = 1.8 × 10−5 for acetic acid.

Correct AnswerverifiedShow Answer

Calculate the ionic strength of a 0.210 M FeCl2 solution.

Correct Answerverified0.630

Which equation is NOT required to determine the molar solubility of AgCN?

Correct AnswerverifiedShow Answer

Calculate the pH of a 0.040 M HCl solution that is also 0.010 M in NaNO3.

For Ag+ when  = 0.01 M, = 0.898 and when  = 0.05, = 0.80.What is the activity coefficient when  = 0.024 M?

Correct AnswerverifiedShow Answer

Which equation is NOT required to determine the pH of 0.10 M solution of weak acid,HA?

Correct AnswerverifiedShow Answer

To correct for the effect of ionic strength on chemical reactions,concentrations are replaced by____________________ in equilibrium expressions.

Correct AnswerverifiedShow Answer

Which of the following is NOT true for pH?

Correct AnswerverifiedShow Answer

____________________ is a measure of the total concentration of ions in solution.

Correct AnswerverifiedShow Answer

All of the following are TRUE for activities and activity coefficients,except:

Correct AnswerverifiedC

The mass balance equation for a 0.10 M HO2CCO2H solution is which of the following?

Correct AnswerverifiedShow Answer

A buffer is prepared from NaH2PO4 and Na2HPO4.The charge balance equation for the buffer is which of the following?

Correct AnswerverifiedShow Answer

Which statement below is NOT correct for the pH of a 0.01 M NaCl solution versus the pH of a 0.01 M in FeSO₄ solution?

Correct Answer
verified

Correct Answer
verified

Calculate the activity coefficient for Fe²⁺ for an ionic strength of 0.034 M.For  = 0.01 M, = 0.675 and for  = 0.05 M, = 0.485.

Correct Answer
verified
 = 0...
View Answer

Calculate the pOH of a 0.010 M HCl solution with an ionic strength of 0.10 M._H+ = 0.83,_OH₋ = 0.76.

Correct Answer
verified

Calculate the pH of a 0.001 M HCN solution.K_a = 6.2 × 10⁻¹⁰

Correct Answer
verified

Which statement below is INCORRECT for the increased solubility of a sparingly soluble salt,AgCl,in an inert salt solution,NaNO₃?

Correct Answer
verified

Calculate the pH of a 0.002 M (CH₃)₃N solution.K_b = 6.6 × 10⁻⁵

Correct Answer
verified

Correct Answer
verified

Calculate the pH of a 0.010 M CH₃CO₂H solution.K_a = 1.8 × 10−⁵ for acetic acid.

Correct Answer
verified

Calculate the ionic strength of a 0.210 M FeCl₂ solution.

Correct Answer
verified
0.630

Correct Answer
verified

Calculate the pH of a 0.040 M HCl solution that is also 0.010 M in NaNO₃.

For Ag⁺ when  = 0.01 M, = 0.898 and when  = 0.05, = 0.80.What is the activity coefficient when  = 0.024 M?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
C

The mass balance equation for a 0.10 M HO₂CCO₂H solution is which of the following?

Correct Answer
verified

A buffer is prepared from NaH₂PO₄ and Na₂HPO₄.The charge balance equation for the buffer is which of the following?

Correct Answer
verified