# CHEMISTRY

posted by .

Assuming that this half cell I2 + 2e- + =>2I- as standard electrode and assumed its potential that is 0.00 V :
a) what is standard potential of this half cell : Br2 + 2e- + => 2Br-

b) what is standard potential of this half cell : Al^+3 + 3e- => Al

• CHEMISTRY -

Look up the standard reduction potentials for I2, Br2, and Al^3+. Then set them up on a sheet of paper something like this, along with H2.
..........................Eo vs SHE
Br2 + 2e --> 2Br^-..........1.07

I2 + 2e --> 2I^- ...........0.54

2H^+ + 2e --> H2............0.00

Al^3+ + 3e --> Al..........-1.66

So I2 is 0.54 above H2, Br2 is 1.07 above H2 and Al^3+ is 1.66 below H2.

If you call I2 0.00, then Br2 is just 1.07-0.54 = 0.53 above I2 and that would be the Eo value vs I2 as 0.00. Then Al^3+ is 1.66 to get to H2 and another 0.54 to get to I2; therefore, on this scale Al^3+ will be 1.66 + 0.54 = 2.20 below I2 and it's Eo value will be -2.20v.

## Similar Questions

1. ### Chemistry

1) Assume that the reference half-cell is changed to a standard mercury-mercury (II) half-cell. a) What would be the reduction potential of a standard chlorine half-cell. c) What would be the cell potential of a standard chlorine-nickel …
2. ### Chemistry

1) Assume that the reference half-cell is changed to a standard mercury-mercury (II) half-cell. a) What would be the reduction potential of a standard chlorine half-cell. c) What would be the cell potential of a standard chlorine-nickel …
3. ### Chem

In conjunction with a standard hydrogen electrode, the La3+|La half-cell is the anode and the standard cell potential is 2.52V. What is the standard reduction potential for the La3+|La half-cell?
4. ### chemistry

Calculate the standard cell potential for the glavanic cell in which the follwoing reactino occurs: 2I^-(aq) + Br2(l) ---> I2(s) + 2Br^-(aq)
5. ### Chemistry

A galvanic cell consists of La^3+/La half-cell and a standard hydrogen electrode. If the La^3+/La half cell functions as the anode and the cell potential is 2.52 V, what is the reduction potential for the La^3+/La half cell?
6. ### chemistry

A voltaic cell is contructed in which a copper wire is placed in a 1.0 M Cu(NO3)2 solution and a strip of gold i placed in a 1.0 M AuNO3 solution. The measured potential of the cell is found to be 1.36V and the copper electrode is …
7. ### chemistry

1. If half cell A has a standard reduction potential of E= -1.10 V and half cell B has a standard reduction potential of E= 0.65 V, which half-cell is the anode?
8. ### Chemistry (Electrochemistry)

The standard potential for the following galvanic cell is 1.72V : Be(s)|Be2+(aq)||Pb2+(aq)|Pb(s) The standard reduction potential for the Pb2+/Pb half-cell: E = -.13V Calculate the standard reduction potential for the Be2+/Be half-cell. …
9. ### Chemistry

A half-cell that consists of a copper wire in 1.00 M CuNO3 solution is connected by a salt bridge to a half cell containing a 1.00 M X(II) acetate solution and an electrode of metal X. The voltage of the cell is 2.00 V, with metal …
10. ### Chemistry

What will be the potential of a cell constructed of a standard hydrogen electrode as one half-cell and a silver wire coated with AgBr dipping into 0.13 M HBr as the other half-cell?

More Similar Questions