Question

What is the standard electrode potential for a galvanic cell constructed in the appropriate way from these two half-cells?

Answer 1

E

θ

Cell

=

+

2.115

l

V

Cathode

Mg

2

+

/

Mg

Anode

Ni

2

+

/

Ni

Explanation:

Look up the reduction potential for each cell in question on a table of standard electrode potential like this one from Chemistry LibreTexts. [1]

Mg

2

+

(

a

q

)

+

2

l

e

−

→

Mg

(

s

)

−

E

θ

=

−

2.372

l

V

Ni

2

+

(

a

q

)

+

2

l

e

−

→

Ni

(

s

)

−

E

θ

=

−

0.257

l

V

The standard reduction potential

E

θ

resembles the electrode's strength as an oxidizing agent and equivalently its tendency to get reduced. The reduction potential of a Platinum-Hydrogen Electrode under standard conditions (

298

l

K

,

1.00

l

kPa

) is defined as

0

l

V

for reference. [2]

A cell with a high reduction potential indicates a strong oxidizing agent- vice versa for a cell with low reduction potentials.

Two half cells connected with an external circuit and a salt bridge make a galvanic cell; the half-cell with the higher

E

θ

and thus higher likelihood to be reduced will experience reduction and act as the cathode, whereas the half-cell with a lower

E

θ

will experience oxidation and act the anode.

E

θ

(

Ni

2

+

/

Ni

)

>

E

θ

(

Mg

2

+

/

Mg

)

Therefore in this galvanic cell, the

Ni

2

+

/

Ni

half-cell will experience reduction and act as the cathode and the

Mg

2

+

/

Mg

the anode.

The standard cell potential of a galvanic cell equals the standard reduction potential of the cathode minus that of the anode. That is:

E

θ

cell

=

E

θ

(

Cathode

)

−

E

θ

(

Anode

)

E

θ

cell

=

−

0.257

−

(

−

2.372

)

E

θ

cell

=

+

2.115

Indicating that connecting the two cells will generate a potential difference of

+

2.115

l

V

across the two cells.

Answer 2

The standard electrode potential for a galvanic cell constructed in the appropriate way from these two half-cells is,

EθCell=+2.115lV

Cathode Mg2+/Mg

Anode Ni2+/Ni

What is a galvanic cell ?

• A galvanic cell or voltaic cell is an electrochemical device that transforms the chemical energy of spontaneous redox reactions into electrical energy.
• electrical cell A voltaic cell is an electrochemical device that produces electricity through chemical processes.
• Use a table of standard electrode potential, such as this one from Chemistry LibreTexts, to look up the reduction potential for each of the questioned cells.

Mg2+(aq)+2le−→Mg(s)−Eθ=−2.372lV

Ni2+(aq)+2le−→Ni(s)−Eθ=−0.257lV

A galvanic cell's standard cell potential is equal to the cathode's standard reduction potential less the anode's standard reduction potential. Which is:

Eθcell=Eθ(Cathode)−Eθ(Anode)

=−0.257−(−2.372)

=+2.115

The standard electrode potential for a galvanic cell constructed in the appropriate way from these two half-cells is,

EθCell=+2.115lV

Cathode Mg2+/Mg

Anode Ni2+/Ni

Learn more about Galvanic cell here:

brainly.com/question/23542257

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