Homework Answers
Nernest eq is
E cell = Eo cell - ( 0.059/n) log Q
where Q = 1 /[H+]^2 , given pH = 6.75 , [H+] = 10^ -6.75 = 1.78 x 10^ - 7 M
Q = ( 1/ 1.78x10^-7)^2 = 3.156 x 10^ 13
n = number of electrons involved per reduction = 2
Eo cell = 0 for H+/H2 reduction
E cell = 0 - ( 0.059/2) log ( 3.156x10^13)
= -0.37 V
Add Answer to:
If the potential of a hydrogen electrode based on the half-reaction 2 H^+ (aq) + 2...
If the potential of a hydrogen electrode based on the half reaction 2H+(aq)+2e−→H2(g) is 0.00V at...
If the potential of a hydrogen electrode based on the half reaction 2H+(aq)+2e−→H2(g) is 0.00V at pH 0.00, what is the potential of the same electrode at pH = 4.00?
Calculate the half cell potential of the hydrogen electrode in a solution of pH = 5,...
Calculate the half cell potential of the hydrogen electrode in a solution of pH = 5, 6, 7, 8, and 9 and at partial pressure of hydrogen of 0.5 + 0.8 atm, respectively at 25 degree C. Cell notation: Pt/H_2/H^+. Plot the half cell potential as a function of pH at above partial pressures of hydrogen. 2H^+ + 2e^- rightarrow H_2 e^0_H^+/H_2 = 0V
Given the following standard reduction potentials: H^+ (aq) + 2e^- rightarrow H_2(g) E degree = 0.00...
Given the following standard reduction potentials: H^+ (aq) + 2e^- rightarrow H_2(g) E degree = 0.00 V Fe^3+ (aq) + 2e^- rightarrow Fe(s) E degree = -0.43 V (a) What is the cell potential by combining the above two half-reactions to make a working voltaic cell (same as galvanic cell)? (b) Which species will be oxidized in anode? Write the half-reaction for the anode. (c) Write the overall reaction and balance the chemical equation for this working voltaic cell. (d)...
a.) A voltaic cell is constructed in which the cathode is a standard hydrogen electrode and...
a.) A voltaic cell is constructed in which the cathode is a standard hydrogen electrode and the anode is a hydrogen electrode (P(H2) = 1 atm) immersed in a solution of unknown [H+]. If the cell potential is 0.204 V, what is the pH of the unknown solution at 298 K? b.) An electrochemical cell is constructed in which a Cr3+(1.00 M)|Cr(s) half-cell is connected to an H3O+(aq)|H2(1 atm) half-cell with unknown H3O+ concentration. The measured cell voltage is 0.366...
Given the measured cell potential, E_cell, is -0.3657 V at 25 degree C in the following...
Given the measured cell potential, E_cell, is -0.3657 V at 25 degree C in the following cell, calculate the H^+ concentration Pt (s)|H_2(g, 0.801 atm)|H^+ (aq, ? M)||Cd^2+ (aq, 1.00 M)|Cd (s) The balanced reduction half-reactions for the cell, and their respective standard reduction potential values, E degree, are as follows. 2H^+ (aq) + 2e^- rightarrow H_2 (g) E degree = 0.00 V Cd^2+ (aq) + 2e^- rightarrow Cd (s) E degree = -0.403 V [H^+] =
help please 9.15 Consider a hydrogen electrode in HBr(aq) Estimate the change in the electro de...
help please
9.15 Consider a hydrogen electrode in HBr(aq) Estimate the change in the electro de potential when the solution is changed from 5.0 mmol dm-3 to at 25°C operating at 1.45 bar. 15.0 mmol dm3 9.16 Devise a cell in which the cell reaction is: Mn(s) + Cl2(g) MnCl2(aq). Give the half-reactions for the electrodes and from the standard cell potential of +2.54 V deduce the standard potential of the Mn2/Mn couple. 9.17 Write the cell reactions, electrode half-reactions...
Suppose there were a new scale for expressing electrode potentials in which the standard potential for...
Suppose there were a new scale for expressing electrode potentials in which the standard potential for the reduction of water in base: 2 H_2O(l) + 2 e^- rightarrow H_2 (g) + 2 OH^- (aq) is assigned an E degree_red value of 0.000 V. In current standard reduction tables, the following reaction has a standard reduction potential of 1.50 V. M^3+ (aq) + 3 e^- rightarrow M(s) What would the reduction potential be on the new scale in which the reduction...
The standard reduction potential of the Ag Ag electrode is +0.80 V and the standard potential...
The standard reduction potential of the Ag Ag electrode is +0.80 V and the standard potential of the cell Fe(s) Fe3+(aq) || Ag" (aq) Ag(s) is +0.84 V. What is the standard reduction potential of the Fe3+1Fe electrode? +1.64 V +0.04 V O-1.64v -0.04 v -0.12 V Question 10 (1 point) In the following cell, A is a standard Co2+1Co electrode connected to a standard hydrogen electrode. If the voltmeter reading is -0.28 V, which half-reaction occurs in the left-hand...
In the following cell, A is a standard Pb2+|Pb electrode connected to a standard hydrogen electrode....
In the following cell, A is a standard Pb2+|Pb electrode connected to a standard hydrogen electrode. For this cell the voltmeter reading is -0.13 V. What is the chemical equation for the cell reaction? Given: Standard reduction potential of the H+/H2 and Pb2+/Pb couples are 0.00 and -0.13 V, respectively. voltmeter saltbridge 1+ Pl(s) LPH2 (g) O Pb2+(aq) + H2(g) --> Pb(s) + 2H+(aq) O Pb(s) + 2H+(aq) --> Pb2+(aq) + H2(g)
Consider an electrochemical cell, starting with standard state conditions, based on the following reaction. 2 H*(aq)+...
Consider an electrochemical cell, starting with standard state conditions, based on the following reaction. 2 H*(aq)+ Cd(s) Cd2+(aq) H2g) Ecell 0.40v Which of the following actions would increase the measured cell potential? Reducing the [H'] in the hydrogen cell O Increasing the mass of the solid Cd electrode Reducing the Cdion concentration O Increasing the pressure of hydrogen gas in the hydrogen cell O None of these
Calculate the half cell potential of the hydrogen electrode in a solution of pH = 5, 6, 7, 8, and 9 and at partial pressure of hydrogen of 0.5 + 0.8 atm, respectively at 25 degree C. Cell notation: Pt/H_2/H^+. Plot the half cell potential as a function of pH at above partial pressures of hydrogen. 2H^+ + 2e^- rightarrow H_2 e^0_H^+/H_2 = 0V
Given the following standard reduction potentials: H^+ (aq) + 2e^- rightarrow H_2(g) E degree = 0.00 V Fe^3+ (aq) + 2e^- rightarrow Fe(s) E degree = -0.43 V (a) What is the cell potential by combining the above two half-reactions to make a working voltaic cell (same as galvanic cell)? (b) Which species will be oxidized in anode? Write the half-reaction for the anode. (c) Write the overall reaction and balance the chemical equation for this working voltaic cell. (d)...
Given the measured cell potential, E_cell, is -0.3657 V at 25 degree C in the following cell, calculate the H^+ concentration Pt (s)|H_2(g, 0.801 atm)|H^+ (aq, ? M)||Cd^2+ (aq, 1.00 M)|Cd (s) The balanced reduction half-reactions for the cell, and their respective standard reduction potential values, E degree, are as follows. 2H^+ (aq) + 2e^- rightarrow H_2 (g) E degree = 0.00 V Cd^2+ (aq) + 2e^- rightarrow Cd (s) E degree = -0.403 V [H^+] =
help please
9.15 Consider a hydrogen electrode in HBr(aq) Estimate the change in the electro de potential when the solution is changed from 5.0 mmol dm-3 to at 25°C operating at 1.45 bar. 15.0 mmol dm3 9.16 Devise a cell in which the cell reaction is: Mn(s) + Cl2(g) MnCl2(aq). Give the half-reactions for the electrodes and from the standard cell potential of +2.54 V deduce the standard potential of the Mn2/Mn couple. 9.17 Write the cell reactions, electrode half-reactions...
Suppose there were a new scale for expressing electrode potentials in which the standard potential for the reduction of water in base: 2 H_2O(l) + 2 e^- rightarrow H_2 (g) + 2 OH^- (aq) is assigned an E degree_red value of 0.000 V. In current standard reduction tables, the following reaction has a standard reduction potential of 1.50 V. M^3+ (aq) + 3 e^- rightarrow M(s) What would the reduction potential be on the new scale in which the reduction...
The standard reduction potential of the Ag Ag electrode is +0.80 V and the standard potential of the cell Fe(s) Fe3+(aq) || Ag" (aq) Ag(s) is +0.84 V. What is the standard reduction potential of the Fe3+1Fe electrode? +1.64 V +0.04 V O-1.64v -0.04 v -0.12 V Question 10 (1 point) In the following cell, A is a standard Co2+1Co electrode connected to a standard hydrogen electrode. If the voltmeter reading is -0.28 V, which half-reaction occurs in the left-hand...
In the following cell, A is a standard Pb2+|Pb electrode connected to a standard hydrogen electrode. For this cell the voltmeter reading is -0.13 V. What is the chemical equation for the cell reaction? Given: Standard reduction potential of the H+/H2 and Pb2+/Pb couples are 0.00 and -0.13 V, respectively. voltmeter saltbridge 1+ Pl(s) LPH2 (g) O Pb2+(aq) + H2(g) --> Pb(s) + 2H+(aq) O Pb(s) + 2H+(aq) --> Pb2+(aq) + H2(g)
Consider an electrochemical cell, starting with standard state conditions, based on the following reaction. 2 H*(aq)+ Cd(s) Cd2+(aq) H2g) Ecell 0.40v Which of the following actions would increase the measured cell potential? Reducing the [H'] in the hydrogen cell O Increasing the mass of the solid Cd electrode Reducing the Cdion concentration O Increasing the pressure of hydrogen gas in the hydrogen cell O None of these
Most questions answered within 3 hours.
-
A local
electronic company primarily manufactures four highly technical
telecommunication products. Each product must be processed...
asked 48 minutes ago -
•Describe the basic structure of collagen monomers •Explain how
amino acid composition of collagen contributes to...
asked 2 hours ago -
Compute the sample correlation coefficient
r for each of the following data sets.
(Use 3 decimal...
asked 3 hours ago -
5a. What are the advantages and disadvantages of Proxy ARP?
b. What is the TTL field...
asked 2 hours ago -
An ice cube (density = 900[kg/m3]) with a side length of
2.54[cm] is held by a...
asked 4 hours ago -
would you say that leaders in the international context are born
or made? That is, can...
asked 4 hours ago -
Instructions
Read the Digital Trends article "Solid state drives are speedier
than hard disk drives. Are...
asked 4 hours ago -
A multiple-choice test consists of 29 questions with possible
answers of a, b, c, d. Estimate...
asked 5 hours ago -
Question 1: Ethanol is the active ingredient of alcoholic
beverages. It is also s a possible...
asked 5 hours ago -
In the process of a simple distillation, the substances in the
still head tube are in...
asked 5 hours ago -
In a normal distribution with mean 3 and standard deviation of
7, what are the upper...
asked 5 hours ago -
A big block stone with mass M explodes and splits in two pieces
with mass 0.40M...
asked 5 hours ago