Question

16. (a) Define the terms: (i) Electrolysis (ii) Electrorefining
(b) Name the cathode and anode used in electrorefining of copper,​

Answer 1

Answer:

Electrolysis -- Electrolysis is defined as a process of decomposing ionic compounds into their elements by passing a direct electric current through the compound in a fluid form. The cations are reduced at cathode and anions are oxidized at the anode.

Electrowinning -- Electrowinning, also called electroextraction, is the electrodeposition of metals from their ores that have been put in solution via a process commonly referred to as leaching. Electrorefining uses a similar process to remove impurities from a metal.

Impure copper plates acts as anode and thin plates of pure copper acts as cathode.......

hope it helps you......

Answer 2

16) a)

(1) Electrolysis = chemical decomposition produced by passing an electric current through a liquid or solution containing ions.

(2) Electrorefining= Electrorefining is a process in which materials, usually metals, are purified by means of an electrolytic cell. ... An electric current is passed between a sample of the impure metal and a cathode when both are immersed in a solution containing cations of the metal

(b). During electrolytic refining of copper, the anode is the positive electrode and is made from impure copper blocks. The electrolyte is a mixture of copper sulphate and sulphuric acid. The negative electrode is cathode. It is made from pure copper.