Assume that you want to construct a voltaic cell that uses the following half re
ID: 1003332 • Letter: A
Question
Assume that you want to construct a voltaic cell that uses the following half reactions:
A2+(aq)+2eA(s)Ered=0.14VB2+(aq)+2eB(s)Ered=1.18V
You begin with the incomplete cell pictured below, in which the electrodes are immersed in water.
What additions must you make to the cell for it to generate a standard emf?
Check all that apply.
Which electrode functions as the cathode?
Which direction do electrons move through the external circuit?
What voltage will the cell generate under standard conditions?
We should add enough salt containing A2+ into the glass containing the electrode A(s) to produce a 1 M A2+ solution.. We should add the salt brige. We should add enough salt containing B2+ into the glass containing the electrode B(s) to produce a 1 M B2+ solution. We should apply the initial emf to the electrodes. We should add enough salt containing A2+ into the glass containing the electrode B(s) to produce a 1 M A2+ solution.. We should add enough salt containing B2+ into the glass containing the electrode A(s) to produce a 1 M B2+ solution.Explanation / Answer
The correct answer is
We should add the salt brige.
Which electrode functions as the cathode?
electrode A
electrode B
Electrode A is cathode because reduction occurs
Which direction do electrons move through the external circuit?
from A to B
from B to A
From B to A
because at electrode B reduction occurred
Here standard reduction potential of B is more negative then A thus it will be oxidized.
so B would be anode and A would be cathode
and the flow of e- from B to A.
Ecell = Ecathode - Eanode
standard cell potential, E^0cell = -0.14 V - (-1.18 V)
1.04 V
We should add the salt brige.