a)Is there a small or large difference between the mass change of the cathode (0

Question

a)Is there a small or large difference between the mass change of the cathode (0.35g) and the mass change of the anode (0.25g).. why is there a difference?

b)explain why the CU+^2 ions move through the Cuso4 solution

c)why is it necessary to rinse both electrodes before drying them and finding their mass?

d) when setting up an electrical circuit which part should be connected into the circuit last? why

e) when dismantling the circuit which part should be disconnected first ?why

f) describe how a current in an electrolyte differs from a current in a copper wire

pts will be given to best answer. Thx

Explanation / Answer

a large difference between the mass change of the cathode and the mass change of the anode is there because The cations associate with the anions in the solution. These cations are reduced at the cathode to deposit in the metallic, zero valence state. For example, in an acid solution, copper is oxidized at the anode to Cu2+ by losing two electrons. The Cu2+ associates with the anion SO42- in the solution to form copper sulfate. At the cathode, the Cu2+ is reduced to metallic copper by gaining two electrons. The result is the effective transfer of copper from the anode source to a plate covering the cathode

b)It is because of the following mechanism in an acid solution, copper is oxidized at the anode to Cu2+ by losing two electrons. The Cu2+ associates with the anion SO42- in the solution to form copper sulfate. At the cathode, the Cu2+ is reduced to metallic copper by gaining two electrons. The result is the effective transfer of copper from the anode source to a plate covering the cathode.

c) The copper cathode is carefully removed from the copper sulphate solution.The copper is then gently washed with distilled
water and then the cathode is dried in the air. It is washed with the distilled water to remove the copper sulphate solution .This will result in accurate measurement,as only the fresh copper will be left on the cathode and that is all that is being investigated.

d)The external power supply should be connected in the last because if connected earlier it would cause the unnecessary flow of current through the circuit.

e)when dismantling the circuit the external supply should be disconnected first in order to stop the reaction furthure.

f)Current in an electrolyte is due to the flow of ions in the solution whereas current in copper wire is caused due to the flow of electrons in the copper wire.

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