Write the equation for each metal combination indicating which metal is being ox

Question

Write the equation for each metal combination indicating which metal is being oxidized and which metal is being reduced. Using the Table above calculate the E E^o_cell for Zn(s)|Zn^2+(aq)||Cu^2+(aq)|Cu(s) Show your work. Using the Nernst equation calculate the E for the cell when Zn^2+ (aq) = 0.10 M and Cu^2+ (aq) = 0.10M Show your work. How does your value in answer #3 compare to what you measured? Using the Nernst equation calculate the E for the cell when Zn^2+ (aq) = 0.10 M and Cu^2+ (aq) = 0.001 M Show your work. How does your value in answer #5 above compare to what you measured? E^o_cell = E^o_cathode - E^o_anode Nernst Equation E = E^o_cell - 0.059/n Times log Q

Explanation / Answer

1) we know that

oxidation takes place at anode

reduction takes place at cathode

so

a) Zn + Cu+2 --> Zn+2 + Cu

oxidized --> Zn

reduced --> Cu+2

b)

3Zn + 2Al+3 --> 3Zn+2 + 2Al

oxidized --> Zn

reduced --> Al+3

c)

Zn + Pb+2 --> Zn+2 + Pb

oxidized --> Zn

reduced --> Pb+2

d) Pb + Cu+2 --> Pb+2 + Cu

oxidized --> Pb

reduced --> Cu+2

e)

3Pb + 2Al+3 --> 3Pb+2 + 2Al

oxidized --> Pb

reduced --> Al+3

f)

3 Cu + 2 Al+3 --> 3 Cu+2 + 2Al

oxidized --> Cu

reduced --> Al+3

g)

Zn + Cu+2 --> Zn+2 + Cu

oxidized --> Zn

reduced --> Cu+2

2)

we know that

Eo cell = Eo cathode - Eo anode

Eo cell = Eo Cu+2/Cu - Eo Zn+2/Zn

Eo cell = 0.34 + 0.76

Eo cell = 1.1

so

the value of Eo cell is 1.1

3)

the reaction is

Zn (s) + Cu+2 (aq) --> Zn+2 (aq) + Cu (s)

the reaction quotient is given by

Q = [Zn+2] / [Cu+2]

Q = 0.1 / 0.1

Q = 1

no2

E = Eocell - (0.059/n) log Q

E = 1.1- (0.059/2) log 1

E = 1.1 V

so

the value of Ecell is 1.1 V

4)

the obtained value is 0.835 V

so

the obtained value is less than the theoretical value

5)

Q = [Zn+2] / [Cu+2]

Q = 0.1 / 0.001

Q = 100

now

E = 1.1 - (0.059/2) log 100

E = 1.041

so

the E cell value is 1.041 V

6)

the obtained value is 0.782 V

so

the obtained value is less than the theoretical value

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