Question

↵Here is the experiment to study the change in emf of daniell cell.
Objective
The goal of this project Is to study the change in E.m.f of a Daniel cell Due to various factors such as Change in concentration, temperature And Area of electrodes.

Materials and Equipment
To do this experiment we will need the following materials and equipment:
v Two beakers.
v Zinc and Copper plate.
v Filter paper.
v Voltmeter.
v Connecting wires.
v Card board.
v KNO3 solution.
v 1 M, 0.1M, 0.01 M solution of :-

a. CuSO4

b. ZnSO4

Procedure

I. Take two beakers and pour the required chemicals in respective beaker and mark them for identification.

II. Take two square to slide in and connecting wire to their screw.

III. Connect negative of the voltmeter to the anode and its positive to the cathode

IV. Take filter paper long enough to dip into both the solution. Dip the filter paper in KNo3 solution and put it as a salt bridge.

V. Put on the electrode voltmeter set up. Note the reading quickly and then put of the electrode voltmeter set up.

VI. For measuring variation with temperature with change in area of electrode use the different size of electrode and then do step 5 again.

VII. For measuring variation with temperature heat the solution and then do step 5 again.

VIII. For measuring variations with change in concentration of electrolyte ,use the electrolytes of different molarity and then do step 5 again.


Observations:-
v Electrode Potential of Zinc =.V
v Electrode Potential of Copper=V
v Variation with Concentration:- Molarity of CuSO4(M) Molarity of ZnSO4(M) Voltmeter Reading (V) v Variation with change in area of electrodes:-
With increase in area or decrease in area of electrode EMF of cell remains same.

v Variation with temperature:- Cuso4(.c) ZnSo4(.c) Voltmeter Reading(V)
Conclusions:-
v The EMF varies non-linearly with change in concentration of reactants.
v Increase in concentration of ions in anode half-cell decreases EMF and vice-verse.
v The EMF is independent of area of electrode.
v The EMF increases with increase in temperature.
Please study the above experiment and please provide me the experimental readings which are to be filled in the observations.

Answer 1

• table for variation with concentration

molarity of CuSO4(M)  molarity of CuSO4 (M) Voltmeter reading

                                                                            CuSO4    ZnSO4

1.   0.1                              0.1                             0.5            0.25
2.  0.05                         0.05                           0.25           0.12

• table for variation with change in area of electrodes

with increase in area or decrease in area of electrode EMF of cell remains the same

• table for variation with temperature

temp of CuSO4 (°C)       temp of CuSO4 (°C)    Voltmeter reading

                                                                             CuSO4      ZnSO4

1. 70                                    70                            0.7            0.4
2. 100                                  100                            1               0.6