Question

hlo define the process of electrolysis

Answer 1

Answer:

Explanation:

electrolysis.  A process in which a chemical change, especially decomposition, is brought about by passing an electric current through a solution of electrolytes so that the electrolyte's ions move toward the negative and positive electrodes and react with them.Electrolysis, process by which electric current is passed through a substance to effect a chemical change. The chemical change is one in which the substance loses or gains an electron (oxidation or reduction). The process is carried out in an electrolytic cell, an apparatus consisting of positive and negative electrodes held apart and dipped into a solution containing positively and negatively charged ions. The substance to be transformed may form the electrode, may constitute the solution, or may be dissolved in the solution. Electric current (i.e., electrons) enters through the negatively charged electrode (cathode); components of the solution travel to this electrode, combine with the electrons, and are transformed (reduced). The products can be neutral elements or new molecules. Components of the solution also travel to the other electrode (anode), give up their electrons, and are transformed (oxidized) to neutral elements or new molecules. If the substance to be transformed is the electrode, the reaction is often one in which the electrode dissolves by giving up electrons.

Answer 2

Electrolytic Refining :

• It is the process of purification of the metal obtained after reduction.

• Various methods for refining are employed but the most common one is electrolytic refining .

• Many metals like Cu, Zn, Ni , Ag, Au, etc. are refined electrolytically.

• In this process, a thick block of impure metal is used as anode and a thin strip of a pure metal is used as cathode.

• A solution of metal salt is used as an electrolyte.

• When electric current is passed , metal ions from the electrolyte are reduced as metal which get deposited on the cathode

• An equivalent amount of pure metal from the anode gets oxidized to metal ion and goes into the electrolyte and from there it goes to cathode and deposit.

• This cycle is repeated until wall of the metal Ion from impure block is dissolved and deposited on the cathode.

• The soluble impurities go into the solution whereas the insoluble impurities settle down below anode and are known as anode mud.

• Here anode is impure copper whereas cathode is a strip of pure copper.

• The electrolyte is a solution of acidified copper sulphate.

• On passing electric current pure copper is deposited on the cathode.