Electrolysis

Electrolysis

Energy change in the electrolytic cell - Electrical energy is converted into chemical energy

Electrolysis of Molten Sodium chloride (NaCl)

NaCl --> Na⁺ + Cl^-

Reaction at Cathode: Na⁺ + 1e- --> Na

Reaction at Anode: 2Cl^- --> Cl₂ + 2e^-

By the electrolysis of molten sodium chloride, Sodium(Na) is formed at the cathode and chlorine((Cl₂) at the anode

Electrolysis of Sodium chloride Solution

NaCl solution contains Na⁺ ions, Cl^- ions and H₂O(water)

Reaction at Cathode: 2H₂O + 2e^- --> H₂ + 2OH^-

^{Reaction at Anode: 2Cl- --> Cl}₂ ^{+ 2e-}

^{Thus, Hydrogen(H}₂^{) is formed at Cathode, and Chlorine(Cl}₂^{) at the Anode.}

^{The remaining solution is sodium hydroxide (NaOH)}

Multiple Choice

When an aqeous solution of sodium chloride is electrolysed, .......... is obtained at the cathode

• Sodium

• Chlorine

• Hydrogen

• Sodium hydroxide

Multiple Choice

The equation for the reaction at the cathode during the electrolysis of NaCl solution is

• Na⁺ + 1e- --> Na

• 2H₂O + 2e^- --> H₂ + 2OH^-

• 2Cl- --> Cl2 + 2e-