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Electrolysis and Electrolytes

Electrolysis ...

Question

Electrolysis of acidulated water is considred to be an example of catalysis.

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Solution

Pure water is almost a non-electrolyte and a polar solvent. It can be electrolytically decomposed by addition of traces of dilute acid which dissociates as ions and help in dissociating water into hydrogen and hydroxide ions.

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Q. Give reason as to why-the electrolysis of acidulated water is considered to be an example of catalysis.

Q. With reference to the electrolysis of acidulated water, answer the following:
(a) Why distill water is a non-electrolyte?
(b) What is the electrolytic cell called?
(c) State what you would observe at the (i) cathode (ii) anode.
(d) Summarize the electrode reactions.
(e) Why is the electrolysis of acidulated water considered as an example of catalysis?

(a) Give reason: The electrolysis of acidulated water is considered to be an example of catalysis.

(b) During the electrolysis of copper [II] sulphate solution using platinum as cathode and carbon as anode

(i) State what you observe at the cathode and at the anode

(ii) State the change noticed in the electrolyte

(iii) Write the reactions at the cathode and at the anode.

(c) Differentiate between electrical conductivity of --- copper sulphate solution and of copper metal.

Q. Assertion :The electrolysis of acidified water is considered to be an example of catalysis. Reason: An addition of acid like sulphuric acid makes it an electrolyte. In the presence of

H^{+}

S O_{4}^{- 2}

, water becomes capable of dissociation. Sulphuric acid does not take part in the reaction but promotes the reaction or increases the rate of the reaction.

In the electrolysis of acidulated water, _______ gas is evolved at anode.

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