Facebook Twitter Instagram
    ScienceMotive
    • Class 9
      • Matter in Our Surroundings
      • Is Matter Around Us Pure
      • Atoms and Molecules
      • Structure of the Atom
      • The Fundamental Unit of Life
    • Class 10
      • Chemistry
    • Class 11
      • Chemisrty
        • Chapter – 1 Some Basic Concepts of Chemistry
        • Chapter – 2 Structure Of Atom
        • Chapter – 3 Classification of Elements and Periodicity in Properties
        • Chapter – 4 Chemical Bonding and Molecular Structure
        • Chapter – 5 States of Matter
        • Chapter – 6 Thermodynamics
        • Chapter – 7 Equilibrium
        • Chapter – 8 Redox Reaction
        • Chapter – 10 s-Block Elements
        • Chapter – 13 Hydrocarbons
    • Class 12
      • Chemistry
        • The Solid State
        • Solutions
        • Electrochemistry
        • Chemical Kinetics
        • Surface Chemistry
        • p – Block Elements
        • d & f Block Elements
        • Coordination Compounds
        • Haloalkanes and Haloarenes
        • Alcohols, Phenols and Ethers
        • Aldehydes, Ketones and Carboxylic Acids
        • Amines
        • Biomolecules
        • Polymers
        • Chemistry in Everyday Life
    • Practice Questions
      • +1
      • +2
    • Test Series
      • Class 9 Test Series
      • Class 10 Test Series
      • Class 11 Test Series
      • Class 12 Test Series
    • World
      • Current Affairs
      • General Knowledge
    ScienceMotive
    Home » Electrolysis and Faraday’s Laws of Electrolysis

    Electrolysis and Faraday’s Laws of Electrolysis

    Dr. Vikas JasrotiaBy Dr. Vikas JasrotiaDecember 22, 2021No Comments
    Share
    Facebook WhatsApp Telegram Twitter Email

    Electrolysis and Faraday’s Laws of Electrolysis

    Electrolysis and Faraday’s Laws

    The process of decomposition of an electrolyte on passing an electric current through its aqueous solution or in the fused state is called electrolysis. An electrolyte (AB) when dissolved in water or when melted dissociates to produce corresponding ions (e.g., A+ and B–). When the circuit is completed by closing the key, the following reactions occur at the two electrodes.

    (a) The cations move towards the cathode. On reaching the cathode, they gain electrons (supplied by the battery) and thus become neutral atoms (At cathode) A+ + e– —>  A (Reduction)


    (b)     The anions move towards the anode and on reaching the anode they lose electrons and convert to neutral atoms.
    (At anode) B– —> B + e– (Oxidation)

    Thus electrons from the source (battery) enter the solution (where they are taken up by cations) at the cathode and leave the solution at the anode. As a result, the flow of electricity continues along with the liberation of ions at the electrodes. Thus electrolysis involves oxidation (de-electronation of the anion) at the anode, and reduction (electronation) at the cathode.

    Note that the above case is very simple where only dissociation of the salt is considered which is true when the electrolyte is taken in the molten state. However, when the aqueous solution of the electrolyte is taken, water also dissociates to a small extent as
    H2O → H+ + OH–

    Thus in such cases, two different cations (H+ and A+) and two different anions (OH– and B–) are present in the solution. Of the two cations, that cation will be liberated at the cathode which has a higher reduction potential. Similarly, of the two anions, that anion will be discharged at the anode which has lower reduction potential. The process of electrolysis is further complicated when the electrodes are attacked by the ions of the electrolyte.

    Faraday’s Laws of Electrolysis

    Faraday’s 1st law: The weight or amount of any substance produced during electrolysis is proportional to the amount of charge or electricity passed into the solution.
    W α Q ⇒ W α it
    W = zit
    Where : z = electrochemical equivalent of substance deposited

    Q = it
    i = Q/t
    i = dQ/dT

    Faraday’s 2nd law: It states that when the same quantity of electricity is passed through solutions of different substances, the amount of substance deposited or liberated is directly proportional to their chemical equivalence. For e.g. when the same quantity of electricity is passed through solutions of two electrolytes A and B, then

    Electrolysis and Faraday’s Laws

    Advertisement
    Electrolysis Faraday's Laws of Electrolysis
    Share. Facebook Twitter Pinterest LinkedIn Tumblr Email
    Dr. Vikas Jasrotia
    • Website

    Related Posts

    CBSE Sample Paper Session 2022-23 (Chemistry) PDF

    September 16, 2022

    Haloalkanes and Haloarenes Class 12 – Questions & Answers

    August 2, 2022

    CBSE Important Questions Electrochemistry

    March 16, 2022

    Leave A Reply Cancel Reply

    READ ALSO

    How to Find the Neutrons

    February 2, 2023

    Value-Based Questions Class 11 Chemistry Chapter 7

    February 1, 2023

    Sample Paper Class 11 Chemistry

    January 31, 2023

    Class 9 Science Chapter 2 Extra Questions and Answers

    January 30, 2023
    Chapter - 2 Structure Of Atom

    How to Find the Neutrons

    By Dr. Vikas JasrotiaFebruary 2, 2023

    How to Find the Neutrons, electrons, and Protons Calculate the number of electrons, protons, and…

    Chapter - 7 Equilibrium

    Value-Based Questions Class 11 Chemistry Chapter 7

    By Dr. Vikas JasrotiaFebruary 1, 2023

    Value-Based Questions Class 11 Chemistry Chapter 7 According to Arrhenius’s theory, acids are substances that…

    Class 11

    Sample Paper Class 11 Chemistry

    By Dr. Vikas JasrotiaJanuary 31, 2023

    Sample Paper Class 11 Chemistry This post contains a detailed syllabus for Class XI Chemistry…

    Advertisement
    Advertisement
    Facebook Twitter Instagram Pinterest YouTube
    • Disclaimer
    • Contact Us
    • Privacy Policy 
    • Terms and Conditions
    © 2023 All Rights Reserved ScienceMotive.

    Type above and press Enter to search. Press Esc to cancel.