(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.
(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.
a)Electrolysis of acidulated water is considered to be an example of catalysis. Ans. 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.
b)
i) Red metal copper deposits at the cathode and colourless odourless gas oxygen at the anode.
ii) The blue colour of copper sulphate solution soon fades.
iii) At Cathode: Cu2++2e−⟶Cu
Anode: OH⟶OH+e−
4[OH]⟶2H2O+O2
c) During electrical conductivity of the copper sulphate solution, the CuSO4 splits into Cu2+ and SO−42 ions. Whereas, copper metal only conducts electricity but does not undergo any change.
a)Electrolysis of acidulated water is considered to be an example of catalysis. Ans. 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.
b)
i) Red metal copper deposits at the cathode and colourless odourless gas oxygen at the anode.
ii) The blue colour of copper sulphate solution soon fades.
iii) At Cathode: Cu2++2e−⟶Cu
Anode: OH⟶OH+e−
4[OH]⟶2H2O+O2
c) During electrical conductivity of the copper sulphate solution, the CuSO4 splits into Cu2+ and SO−42 ions. Whereas, copper metal only conducts electricity but does not undergo any change.
