1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Difference between the bleaching action of SO2 and CL2

which is a better bleaching agent

Poll closed Jun 21, 2007.
  1. hno3

    1 vote(s)
  2. cl2

    0 vote(s)
  1. Jun 7, 2007 #1
    SO2 and Cl2 are both bleaching agents. but hoe do they differ based on the bleaching action?

    plz help!@!!
  2. jcsd
  3. Jun 7, 2007 #2


    User Avatar
    Homework Helper
    Education Advisor
    Gold Member

    A quick guess, not necessarily the most correct guess, is that they differ by their oxidation potentials. They may also differ by identity of resulting reduced products. Sulfur compounds may or may not be advantageous or troublesome as products.
  4. Jun 8, 2007 #3
    thank you for this
  5. Jun 11, 2007 #4


    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    Actually, SO2 is a reducing agent. When it reacts with water, it produces sulfonic acid, H2SO3. The anion of this acid is sulfite and bisulfite. These are added to foods to block the action of oxidation from atmospheric oxygen.

    Hint: Look up the Kraft sulfite bleaching process.
  6. Jun 12, 2007 #5
    thanx for tjhis
  7. Aug 1, 2007 #6
    Similarities -The one thing common between their bleaching action is both of them requires
    Moisture for bleaching action.
    Differences -
    The bleaching action by chlorine is based on Oxidation means it requires nascent oxygen for
    Bleaching action. While sulphur dioxide bleaching is based upon the reduction (Use of the
    nascent hydrogen)
    Another difference is the bleaching action of sulphur dioxide is temporary while bleaching
    Action of chlorine is permanent.
    Basically bleaching action by chlorine is strong-Used for bleaching cotton, jute,It also
    Damages delicate fibres by vigorous reaction.
    While SO2 is Mild bleaching agent..Used to bleach delicate fibres like silk,wool..Does not
    damage fabric as its not strong.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook