Home
Class 12
CHEMISTRY
An equeous solutioon of NaCI is electrol...

An equeous solutioon of `NaCI` is electrolysed with inert electrodes. Write the equations for the reactions taking place at cathode and anode. What happens if `aNO_(3(eq.))` is used instead of `NaCI`?

Text Solution

Verified by Experts

For `NaCI_((eq)), anode: 2CI^(-) rarr CI_(2) +2e^(-)`
`{:(,"cathode",:,2H^(+)+2e^(-),rarrH_(2)),("For"NaNO_(3(eq)),"anode",:,2OH^(-)rarr,H_(2)O+(1)/(2)O_(2)+2e^(-)),(,"cathode",:,2H^(+)+2e^(-),rarrH_(2)):}`
Promotional Banner

Similar Questions

Explore conceptually related problems

Accidentally chewing on a stray fragmet of aluminium foil can causes a sharp tooth path if the aluminium comes in contact with an amalgam filing. The filing, an alloy of silver, tin and mercury, acts as the cathode of a tiny galvanic cell, the aluminium behaves as the anode, and salivas serves as the electrolyte. when the aluminium and teh filling come in contact, and electric current passage from the aluminium to the filling which is sensed by a nerve in the tooth. Aluminium is oxidized at the anode, and O_(2) gas is reduced to water at the cathode. E_(AI^(3+)//AI)^(@) =- 1.66 E_(O_(2)H^(+)//H_(2)O)6^(@) = 1.23 V Net reaction taking place when amalgam is in contact with aluminium foil:

Fuel cells : Fuel cells are galvanic cells in which the chemical energy of fuel cell is directly converted into electrical energy. A type of fuel cell is a hydrogen - oxygen fuel cell. It consists of two electrodes made up of two porous graphite impregnated with a catalyst ( platinum, silver, or metal oxide ). The electrodes are placed in aqueous solution of NaOH . Oxygen and hydrogen are continuously fed into the cell. Hydrogen gets oxidized to H^(o+) which is neutralized by overset(c-)(O)H, i.e., anodic reaction. At cathode, O_(2) gets reduced to overset(c-)(O)H Hence, the net reaction is The overall reaction has DeltaH=-285.6 kJ mol^(-1) and DeltaG=-237.4 kJ mol^(-1) at 25^(@)C What is the value of DeltaS^(c-) for the fuel cell at 25^(@)C ?