Question 4 - Daniell Cell

Question 1

Which is the cathode and which is the anode in a Daniell’s cell?

Answer 1

Zinc/zinc sulphate is the anode
Copper/copper sulphate is the cathode

Question 2

Where do reduction and oxidation happen in a cell?

Answer 2

Reduction = cathode
Oxidation = anode

Question 3

How is the Daniell’s cell written using standard cell notation?

Answer 3

Zn(s)|Zn2+(aq)||Cu2+(aq)|Cu(s)

Question 4

How is E cell calculated?

Answer 4

Ecell = Ecathode - Eanode

Question 5

How are the cathode and anode determined using reduction potentials?

Answer 5

Greater reduction potential = cathode

Question 6

What equation is used to find the potential?

Answer 6

Nernst equation, Ecell = Ecell - RT/zF lnQ

Question 7

What is the equation used to find Q?

Answer 7

Q = a(products)/a(reactants)
a = activity

Question 8

How do you find activity to fin Q?

Answer 8

Concentration.
a = y x molarity, at dilute concentration y->1 and molarity->concentration. Therefore activity = molar concentration.

Question 9

When would you add a power to the equation to find Q?

Answer 9

When there is a big number infront of a product or reactant.
Eg. 2Ag, [Ag]^2