Advertisements
Advertisements
Question
The following Question refer to the electrolysis of copper sulphate solution with copper electrodes:
(a) Compare the change in mass of the anode
(b) What is seen to happen to the colour of the copper sulphate solution if platinum electrodes are used? Explain the observation.
(c) What is the practical application of the electrolysis of copper sulphate solution? Briefly, describe one such application.
Solution
(a) As for every copper ion discharged at the cathode, an ion of copper is formed at the anode which goes into the solution .Since atoms of copper are deposited at the cathode, the cathode becomesthicker and as the atoms of copper from the anode change into ions of copper, the anode becomes thinner.
(b) When platinum rods are used as electrodes, then x the blue colour of copper sulphate solution fades and sulphuric acid is formed. This is because oxygen is liberated at anode and copper metal is deposited at cathode
(c) Practical application of electrolysis of copper sulphate solution: This is the basis for purification of copper.
Other metals like Zinc, Nickel, Silver .Lead can also be purified.
APPEARS IN
RELATED QUESTIONS
State the observations at the anode and at the cathode during the electrolysis of fused lead bromide using graphite electrodes
The electrolysis of acidified water is an example of :
(A) Reduction
(B) Oxidation
(C) Redox reaction
(D) Synthesis
Molten lead bromide conducts electricity. It is called an ______. It is composed of lead ______ and bromide ______. The lead ions are ______ charged and are called ______. The bromide ______ are ______ charged and are called ______.
Explain, why during the electrolysis of copper sulphate using copper electrodes, the colour of solution does not fade?
How is electrolytic dissociation different from thermal dissociation?
Explain, why copper though a good conductor of electricity is, a non- electrolyte.
Fill in the blank.
As we descend the electrochemical series containing cations, the tendency of the cations to get ________ at the cathode increases.
Fill in the blank from the choices given below :
Electro covalent compounds have a _____ boiling point
State one observation when electricity is passed through molten lead bromide.
From the following list of substances choose those which meet the description given below.
Ammonium chloride, ammonium nitrate, chlorine, dilute hydrochloric acid, iron, lead nitrate, manganese (IV) oxide, silver nitrate, sodium nitrate, sodium nitrite, and sulphur.
Two compounds whose aqueous solutions give white precipitates with dilute hydrochloric acid.
