Explore BrainMass
Share

Calculate the standard emf for each of the following reactions

This content was STOLEN from BrainMass.com - View the original, and get the already-completed solution here!

1. Calculate the standard emf for each of the following reactions:

a)H2(g) + F2(g)---> 2H+(aq) + 2F-(aq)
b)Cu(s) + Ba 2+(aq)---> Cu 2+(aq) + Ba(s)
c)3Fe 2+(aq)---> Fe(s) + 2Fe 3+(aq)
d)Hg2 2+(aq) + 2Cu+(aq)----> 2Hg(l) + 2Cu 2+(aq)

2. The standard reduction potential for the reduction of RuO4-(aq) to RuO4 2-(aq) is +0.59 V. Which of the following substances can oxidize RuO4 2-(aq) to RuO4-(aq) under standard conditions: Cr2O7 2-(aq), ClO-(aq), Pb 2+(aq), I2(s), Ni 2+(aq)?

3. Using standard reduction potentials, calculate the equilibrium constant for each of the following reactions at 298 K:
a) 2 VO2+(aq) + 4 H+(aq) + 2 Ag(s)-----> 2 VO 2+(aq) + 2 H2O(l), 2 Ag+(aq)
b) 3 Ce 4+(aq) + Bi(s) + H2O(l) -----> 3 Ce 3+(aq) + BiO+(aq) + 2 H+(aq)
c) N2H5+(aq) + 4 Fe(CN)6 3-(aq)-----> N2(g) + 5 H+(aq) + 4 Fe(CN)6 4-(aq)

4. A voltaic cell is constructed that is based on the following reaction:
Sn 2+(aq) + Pb(s)----> Sn(s) + Pb 2+(aq)
a) If the concentration of Sn 2+ in the cathode compartment is 1.00 M and the cell generates an emf of +0.22 V, what is the concentration of Pb 2+ in the anode compartment?

b) If the anode compartment contains [SO4 2-]= 1.00 M in equilibrium with PbSO4(s), what is the Ksp of PbSO4?

5. a) Draw two linkage isomers of [Co(NH3)5 SCN]2+
b) Draw the two geometric isomers of [Co(NH3)3 Cl3]2+
c) Two compounds with the formula Co(NH3)5ClBr can be prepared. Use structural formulas to show how they differ. What kind of isomerism does this illustrate?

© BrainMass Inc. brainmass.com October 17, 2018, 12:47 am ad1c9bdddf
https://brainmass.com/chemistry/physical-chemistry/calculate-standard-emf-following-reactions-310443

Solution Preview

Hello, attached are the solutions to your problems.

I hope that you find it helpful!

1. Calculate the standard emf for each of the following reactions:
a)H2(g) + F2(g)---> 2H+(aq) + 2F-(aq)
H2(g) 2H+(aq) + 2e- E°red = 0.00 V
F2(g) + 2e- 2F -(aq) E°red = 2.87 V
_______________________________________________
H2(g) + F2(g) 2H+(aq) + 2F -(aq) E° = 2.87 V
E° = E°red(reduction) - E°red(oxidation) = 2.87 V - 0.00 V = 2.87 V

b)Cu(s) + Ba 2+(aq)---> Cu 2+(aq) + Ba(s)
Cu(s) Cu2+(aq) + 2e- E°red = 0.337 V
Ba2+(aq) + 2e- Ba(s) E°red = -2.90 V
___________________________________________________
Cu(s) + Ba2+(aq) Cu2+(aq) + Ba(s) E° = -3.24 V
E° = E°red(reduction) - E°red(oxidation) = -2.90 V - 0.337 V = -3.24 V

c)3Fe 2+(aq)---> Fe(s) + 2Fe 3+(aq)
Fe2+(aq) + 2e- Fe(s) E°red = -0.440 V
2Fe2+(aq) 2Fe3+(aq) + 2e E°red = 0.771 V
___________________________________________________
3Fe2+(aq) Fe(s) + 2Fe3+(aq) E° = -1.211 V
E° = E°red(reduction) - E°red(oxidation) = -0.440 V - 0.771 V = -1.211 V

d)Hg2 2+(aq) + 2Cu+(aq)----> 2Hg(l) + 2Cu 2+(aq)
Hg22+(aq) + 2e- 2Hg(l) E°red = 0.789 V
2Cu+(aq) 2Cu2+(aq) + 2e E°red = 0.153 ...

Solution Summary

The expert calculates the standard emf for each of the reactions.

$2.19
Similar Posting

Voltaic Cell EMF: numerical problems

1. Using data in Appendix E, calculate the standard emf for each of the following reactions:
(a) H2(g) + F2(g) → 2 H+(aq) + 2 F-(aq)
(b) Cu2+(aq) + Ca(s) → Cu(s) + Ca2+(aq)
(c) 3 Fe2+(aq) → Fe(s) + 2 Fe3+(aq)
(d) 2 ClO3-(aq) + 10 Br-(aq) + 12 H+(aq) → Cl2(g) + 5 Br2(l) + 6 H2O(l)

2. Using the standard reduction potentials listed in Appendix E, calculate the equilibrium constant for each of the following reactions at 298 K:
(a) Cu(s) + 2 Ag+(aq) → Cu2+ (aq) + 2 Ag(s)
(b) 3 Ce4+(aq) + Bi(s) + H2O(l) → 3 Ce3+(aq) + BiO+(aq) + 2 H+(aq)
(c) N2H5+(aq) + 4 Fe(CN)63-(aq) → N2(g) + 5 H+(aq) + 4 Fe(CN)64-(aq)

3. A voltaic cell is constructed with two silver-silver chloride electrodes, each of which is based on the following half-reaction:
AgCl(s) + e- → Ag(s) + Cl-(aq)
The two half-cells have [Cl-] = 0.0150 M and [Cl-] = 2.55 M, respectively. (a) Which electrode is the cathode of the cell? (b) What is the standard emf of the cell? (c) What is the cell emf for the concentrations given? (d) For each electrode, predict whether [Cl-] will increase, decrease, or stay the same as the cell operates.

View Full Posting Details