Question 1

What is the conjugate acid of O2-?

Accepted Answer

OH<sup>-</

Question 2

Choose the effective pH range of a pyridine/pyridinium chloride buffer? For pyridine, the value of Kb is 1.8 * 10-9.

Accepted Answer

A)  9.1-11.1 
B)  1.4-3.4 
C)  10.3-12.3 
D)  7.7-9.7 
E)  4.3-6.3 
A)  9.1-11.1 
B)  1.4-3.4 
C)  10.3-12.3 
D)  7.7-9.7 
E)  4.3-6.3

Question 3

Which metal will dissolve in hydrochloric acid?

Accepted Answer

A)  All the metals listed will dissolve. 
B)  Fe 
C)  Ag 
D)  Pt 
E)  Au 
A)  All the metals listed will dissolve. 
B)  Fe 
C)  Ag 
D)  Pt 
E)  Au

Question 4

What is E for the half-reaction below?
H2(g,1.00 atm)$\rightarrow$2H+(aq,1.00 M)+ 2e-

Accepted Answer

The answer of What is E for the half-reaction below?
H2(g,1.00...

Question 5

Consider the following cell:
Pt|H2(g,1 atm)|H+(aq,? M)M Ag+(aq,1.0 M)|Ag(s)
If the voltage of this cell is 1.04 V at25$\omicron$C and the standard potential of the Ag+/Ag couple is +0.80 V,Calculate the hydrogen ion concentration in the anode compartment.

Accepted Answer

A)  4.6 * 10-10 M 
B)  8.8 * 10-5 M 
C)  9.4 *10-3 M 
D)  1.0 M 
E)  3.7 * 10-8 M 
A)  4.6 * 10-10 M 
B)  8.8 * 10-5 M 
C)  9.4 *10-3 M 
D)  1.0 M 
E)  3.7 * 10-8 M

Question 6

Which of the following indicators would be most suitable for the titration of 0.10 M lactic acid with 0.10 M KOH(aq)? For lactic acid, pKa = 3.08.

Accepted Answer

A)  Methyl orange (pKIn = 3.4) 
B)  Thymol blue (pKIn = 1.7) 
C)  Alizarin yellow (pKIn = 11.2) 
D)  Bromophenol blue (pKIn = 3.9) 
E)  Phenol red (pKIn = 7.9) 
A)  Methyl orange (pKIn = 3.4) 
B)  Thymol blue (pKIn = 1.7) 
C)  Alizarin yellow (pKIn = 11.2) 
D)  Bromophenol blue (pKIn = 3.9) 
E)  Phenol red (pKIn = 7.9)

Question 7

Use the following to answer questions 55-58:  
-The galvanic cell shown above uses the half-cells Pb2+/Pb and Zn2+/Zn, and a salt bridge containing KCl(aq).The voltmeter gives a positive voltage reading.Identify A and write the half-reaction that occurs in that compartment.Does the size of the electrode A increase or decrease during operation of the cell? What is the voltmeter reading?

Accepted Answer

A IS Zn(S); Zn(S)@#LAT-DLM& Zn

Question 8

Which of the following is the conjugate acid of H2PO4-?

Accepted Answer

A)  PO43- 
B)  OH- 
C)  H3PO4 
D)  H2PO4- 
E)  HPO42- 
A)  PO43- 
B)  OH- 
C)  H3PO4 
D)  H2PO4- 
E)  HPO42-

Question 9

The following 0.1 M aqueous solutions are arranged in order of increasing pH, with the highest pH on the far right. $$\begin{array} { | l | l | l | l | l | } 
\hline \mathrm { HClO } _ { 4 } & & \left( \mathrm { CH } _ { 3 } \right) _ { 3 } \mathrm { NHCl } & \mathrm { KBr } & \mathrm { KNO } _ { 2 } \
\hline
\end{array}$$
Which one of the following 0.10 M aqueous solutions should be placed in the empty box?

Accepted Answer

A)  NaI 
B)  HCOOH 
C)  C6H5NH2  
D)  CH3NH3Cl 
E)  NaClO 
A)  NaI 
B)  HCOOH 
C)  C6H5NH2  
D)  CH3NH3Cl 
E)  NaClO

Question 10

Write the charge balance equation for a dilute aqueous solution of HI.

Accepted Answer

A)  [I-] = [OH-] + [H3O+] 
B)  [H3O+] = [OH-] 
C)  [H3O+] = [I-] 
D)  [H3O+] = [I-] + [OH-] 
E)  [HI]initial = [I-] 
A)  [I-] = [OH-] + [H3O+] 
B)  [H3O+] = [OH-] 
C)  [H3O+] = [I-] 
D)  [H3O+] = [I-] + [OH-] 
E)  [HI]initial = [I-]

Question 11

Of the following, which is the strongest acid?

Accepted Answer

A)  CH3COOH (pKa = 4.75) 
B)  HNO2 (pKa = 3.37) 
C)  HF (pKa = 3.45) 
D)  HCN (pKa = 9.31) 
E)  HIO3 (pKa = 0.77) 
A)  CH3COOH (pKa = 4.75) 
B)  HNO2 (pKa = 3.37) 
C)  HF (pKa = 3.45) 
D)  HCN (pKa = 9.31) 
E)  HIO3 (pKa = 0.77)

Question 12

When the Ag(s)|AgCl(s|Cl-(aq) electrode acts as a cathode,
The reaction is

Accepted Answer

A)  Ag+(aq) + e- $\rightarrow$ Ag(s). 
B)  Ag(s) + Cl-(aq) $\rightarrow$ AgCl(s) + e-.  
C)  Ag(s) $\rightarrow$Ag+(aq) + e-.  
D)  2AgCl(s) + 2e-$\rightarrow$ 2Ag+(aq) + Cl2(g). 
E)  AgCl(s) + e-$\rightarrow$ Ag(s) + Cl-(aq). 
A)  Ag+(aq) + e- $\rightarrow$ Ag(s). 
B)  Ag(s) + Cl-(aq) $\rightarrow$ AgCl(s) + e-.  
C)  Ag(s) $\rightarrow$Ag+(aq) + e-.  
D)  2AgCl(s) + 2e-$\rightarrow$ 2Ag+(aq) + Cl2(g). 
E)  AgCl(s) + e-$\rightarrow$ Ag(s) + Cl-(aq).

Question 13

The solubility of silver bromide is greater in 0.10 M NaBr than in pure water.

Accepted Answer

A) True 
 B)False

Question 14

If a small amount of a strong acid is added to buffer made up of a weak acid, HA,And the sodium salt of its conjugate base,NaA,The pH of the buffer solution does not change appreciably because

Accepted Answer

A)  the Ka of HA is changed. 
B)  the strong acid reacts with A- to give HA, which is a weak acid. 
C)  no reaction occurs. 
D)  the strong acid reacts with HA to give H2A+. 
E)  the strong acid reacts with A- to give H2A+. 
A)  the Ka of HA is changed. 
B)  the strong acid reacts with A- to give HA, which is a weak acid. 
C)  no reaction occurs. 
D)  the strong acid reacts with HA to give H2A+. 
E)  the strong acid reacts with A- to give H2A+.

Question 15

The Ka of phenol is 1.3 * 10-10 .For a solution labeled "1.0 * 10-3 M aqueous phenol,"

Accepted Answer

A)  Kw/[H3O+] >> [phenol]initial. 
B)  Kw/[H3O+] initial. 
C)  [H3O+] > 10-6. 
D)  pH ~ 4. 
E)  [H3O+] = [H3O+]2/[phenol]initial. 
A)  Kw/[H3O+] >> [phenol]initial. 
B)  Kw/[H3O+] initial. 
C)  [H3O+] > 10-6. 
D)  pH ~ 4. 
E)  [H3O+] = [H3O+]2/[phenol]initial.

Question 16

A buffer solution contains 0.75 mol KH2PO4 and 0.75 mol K2HPO4 .
What is the pH after 0.10 mol KOH is added to 1.00 L of this buffer? The pKa of H2PO4? is 7.21.

Accepted Answer

A)  6.91 
B)  6.67 
C)  7.21 
D)  7.33 
E)  7.09 
A)  6.91 
B)  6.67 
C)  7.21 
D)  7.33 
E)  7.09

Question 17

Use the following to answer questions 55-58:  
-The galvanic cell shown above uses the half-cells Pb2+/Pb and Zn2+/Zn,and a salt bridge containing KCl(aq).The voltmeter gives a positive voltage reading.Theelectrode B could be inert platinum metal or lead.

Accepted Answer

A) True 
 B)False

Question 18

What is the pH of an aqueous solution that is 0.011 M HF (Ka = 3.5 * 10-4) and 0.015 M NaF?

Accepted Answer

A)  1.95 
B)  3.46 
C)  3.59 
D)  5.27 
E)  3.33 
A)  1.95 
B)  3.46 
C)  3.59 
D)  5.27 
E)  3.33

Question 19

If 8686 C of charge is passed through molten magnesium chloride, calculate the number of moles of Mg(l)
Produced.

Accepted Answer

A)  0.0225 mol 
B)  0.0450 mol 
C)  2.00 mol 
D)  0.0110 mol 
E)  0.0900 mol 
A)  0.0225 mol 
B)  0.0450 mol 
C)  2.00 mol 
D)  0.0110 mol 
E)  0.0900 mol

Question 20

If pKa1 and pKa2 for H2S are 6.88 and 14.15, respectively,Calculate the equilibrium constant for the reaction below:
H2S(aq)+ 2H2O(l)$\Leftrightarrow$2H3O+(aq)+ S2-(aq)

Accepted Answer

A)  1.3 * 10-7  
B)  1.1 * 10-7  
C)  7.7 *10-8  
D)  9.2 * 10-22  
E)  7.1 * 10-15  
A)  1.3 * 10-7  
B)  1.1 * 10-7  
C)  7.7 *10-8  
D)  9.2 * 10-22  
E)  7.1 * 10-15

What is the conjugate acid of O²^-?

Choose the effective pH range of a pyridine/pyridinium chloride buffer? For pyridine, the value of K_b is 1.8 * 10^-⁹.

Which metal will dissolve in hydrochloric acid?

What is E for the half-reaction below? H₂(g,1.00 atm) $\rightarrow$ 2H⁺(aq,1.00 M)+ 2e^-

Consider the following cell: Pt|H₂(g,1 atm)|H⁺(aq,? M)M Ag⁺(aq,1.0 M)|Ag(s) If the voltage of this cell is 1.04 V at25^$\omicron$C and the standard potential of the Ag⁺/Ag couple is +0.80 V,Calculate the hydrogen ion concentration in the anode compartment.

Which of the following indicators would be most suitable for the titration of 0.10 M lactic acid with 0.10 M KOH(aq)? For lactic acid, pK_a = 3.08.

Which of the following is the conjugate acid of H₂PO₄^-?

The following 0.1 M aqueous solutions are arranged in order of increasing pH, with the highest pH on the far right. Which one of the following 0.10 M aqueous solutions should be placed in the empty box?

Write the charge balance equation for a dilute aqueous solution of HI.

Of the following, which is the strongest acid?

When the Ag(s)|AgCl(s|Cl^-(aq) electrode acts as a cathode, The reaction is

The solubility of silver bromide is greater in 0.10 M NaBr than in pure water.

If a small amount of a strong acid is added to buffer made up of a weak acid, HA,And the sodium salt of its conjugate base,NaA,The pH of the buffer solution does not change appreciably because

The K_a of phenol is 1.3 * 10^-¹⁰ .For a solution labeled "1.0 * 10^-³ M aqueous phenol,"

A buffer solution contains 0.75 mol KH₂PO₄ and 0.75 mol K₂HPO₄ . What is the pH after 0.10 mol KOH is added to 1.00 L of this buffer? The pK_a of H₂PO₄^? is 7.21.

Use the following to answer questions 55-58: -The galvanic cell shown above uses the half-cells Pb²⁺/Pb and Zn²⁺/Zn,and a salt bridge containing KCl(aq).The voltmeter gives a positive voltage reading.Theelectrode B could be inert platinum metal or lead.

What is the pH of an aqueous solution that is 0.011 M HF (K_a = 3.5 * 10^-⁴) and 0.015 M NaF?

If 8686 C of charge is passed through molten magnesium chloride, calculate the number of moles of Mg(l) Produced.

If pK_a1 and pK_a2 for H₂S are 6.88 and 14.15, respectively,Calculate the equilibrium constant for the reaction below: H₂S(aq)+ 2H₂O(l) $\Leftrightarrow$ 2H₃O⁺(aq)+ S²^-(aq)

Atoms

Molecules

States of Matter

Thermodynamics

Equilibrium

Kinetics

The Main-Group Elements

The D-Block Elements

Nuclear Chemistry

Organic Chemistry

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Exam 6: Reactions

What is the conjugate acid of O2-?

Choose the effective pH range of a pyridine/pyridinium chloride buffer? For pyridine, the value of Kb is 1.8 * 10-9.

Which metal will dissolve in hydrochloric acid?

What is E for the half-reaction below? H2(g,1.00 atm) →\rightarrow→ 2H+(aq,1.00 M)+ 2e-

Consider the following cell: Pt|H2(g,1 atm)|H+(aq,? M)M Ag+(aq,1.0 M)|Ag(s) If the voltage of this cell is 1.04 V at25 ο\omicronο C and the standard potential of the Ag+/Ag couple is +0.80 V,Calculate the hydrogen ion concentration in the anode compartment.

Which of the following indicators would be most suitable for the titration of 0.10 M lactic acid with 0.10 M KOH(aq)? For lactic acid, pKa = 3.08.

Which of the following is the conjugate acid of H2PO4-?

The following 0.1 M aqueous solutions are arranged in order of increasing pH, with the highest pH on the far right. Which one of the following 0.10 M aqueous solutions should be placed in the empty box?

Write the charge balance equation for a dilute aqueous solution of HI.

Of the following, which is the strongest acid?

When the Ag(s)|AgCl(s|Cl-(aq) electrode acts as a cathode, The reaction is

The solubility of silver bromide is greater in 0.10 M NaBr than in pure water.

If a small amount of a strong acid is added to buffer made up of a weak acid, HA,And the sodium salt of its conjugate base,NaA,The pH of the buffer solution does not change appreciably because

The Ka of phenol is 1.3 * 10-10 .For a solution labeled "1.0 * 10-3 M aqueous phenol,"

A buffer solution contains 0.75 mol KH2PO4 and 0.75 mol K2HPO4 . What is the pH after 0.10 mol KOH is added to 1.00 L of this buffer? The pKa of H2PO4? is 7.21.

Use the following to answer questions 55-58: -The galvanic cell shown above uses the half-cells Pb2+/Pb and Zn2+/Zn,and a salt bridge containing KCl(aq).The voltmeter gives a positive voltage reading.Theelectrode B could be inert platinum metal or lead.

What is the pH of an aqueous solution that is 0.011 M HF (Ka = 3.5 * 10-4) and 0.015 M NaF?

If 8686 C of charge is passed through molten magnesium chloride, calculate the number of moles of Mg(l) Produced.

If pKa1 and pKa2 for H2S are 6.88 and 14.15, respectively,Calculate the equilibrium constant for the reaction below: H2S(aq)+ 2H2O(l) ⇔\Leftrightarrow⇔ 2H3O+(aq)+ S2-(aq)

Atoms

Molecules

States of Matter

Thermodynamics

Equilibrium

Kinetics

The Main-Group Elements

The D-Block Elements

Nuclear Chemistry

Organic Chemistry

Filters

What is the conjugate acid of O²^-?

Choose the effective pH range of a pyridine/pyridinium chloride buffer? For pyridine, the value of K_b is 1.8 * 10^-⁹.

What is E for the half-reaction below? H₂(g,1.00 atm) $\rightarrow$ 2H⁺(aq,1.00 M)+ 2e^-

Consider the following cell: Pt|H₂(g,1 atm)|H⁺(aq,? M)M Ag⁺(aq,1.0 M)|Ag(s) If the voltage of this cell is 1.04 V at25^$\omicron$C and the standard potential of the Ag⁺/Ag couple is +0.80 V,Calculate the hydrogen ion concentration in the anode compartment.

Which of the following indicators would be most suitable for the titration of 0.10 M lactic acid with 0.10 M KOH(aq)? For lactic acid, pK_a = 3.08.

Which of the following is the conjugate acid of H₂PO₄^-?

When the Ag(s)|AgCl(s|Cl^-(aq) electrode acts as a cathode, The reaction is

The K_a of phenol is 1.3 * 10^-¹⁰ .For a solution labeled "1.0 * 10^-³ M aqueous phenol,"

A buffer solution contains 0.75 mol KH₂PO₄ and 0.75 mol K₂HPO₄ . What is the pH after 0.10 mol KOH is added to 1.00 L of this buffer? The pK_a of H₂PO₄^? is 7.21.

Use the following to answer questions 55-58: -The galvanic cell shown above uses the half-cells Pb²⁺/Pb and Zn²⁺/Zn,and a salt bridge containing KCl(aq).The voltmeter gives a positive voltage reading.Theelectrode B could be inert platinum metal or lead.

What is the pH of an aqueous solution that is 0.011 M HF (K_a = 3.5 * 10^-⁴) and 0.015 M NaF?

If pK_a1 and pK_a2 for H₂S are 6.88 and 14.15, respectively,Calculate the equilibrium constant for the reaction below: H₂S(aq)+ 2H₂O(l) $\Leftrightarrow$ 2H₃O⁺(aq)+ S²^-(aq)