Decomposition of ceramic oxides, in general

Discussion in 'Chemistry' started by Facial, Mar 14, 2007.

  1. Facial Valued Senior Member

    Messages:
    2,217
    I think I asked this awhile back before this forum was created.

    I still have trouble understanding how, upon heating (in a presumably normal atmosphere at STP) we have alkaline metal oxides such as K2O 'decompose' upon heating at around 1500 degrees Celsius. My question is : decompose into what?

    Someone has mentioned that the alkaline metals form hydroxides at those temperatures - but aren't hydroxides dehydrated themselves into regular oxides (as in the case of MgOH into MgO) upon heating?
     
  2. Google AdSense Guest Advertisement



    to hide all adverts.
  3. MetaKron Registered Senior Member

    Messages:
    5,502
    Wikipedia says that potassium oxide decomposes into potassium peroxide and potassium when headed above 350 degrees Celsius.
     
  4. Google AdSense Guest Advertisement



    to hide all adverts.
  5. Chatha big brown was screwed up Registered Senior Member

    Messages:
    1,867
    Well, i'm not sure, but K20 is not an alkaline, unless you meant KOH. You need an OH group in any base, unless of cause its alkyl, then you have alcohol. My guess is that a perioxide is formed along with the metal. But the general rule is a product of water and metal oxide. NaOH ---> Na2O + H2O
     
  6. Google AdSense Guest Advertisement



    to hide all adverts.
  7. Positron Agony: Not all pain is gain Registered Senior Member

    Messages:
    171
    I would assume that you get Potassium Metal and Oxygen for K2O.

    Now if you mean KOH then I would think you would get Potassium Oxide and water.

    heat
    2K2O >>> 4K+O2

    heat
    2KOH >>> K2O+H2O
     
    Last edited: Mar 15, 2007
  8. Facial Valued Senior Member

    Messages:
    2,217
    Oops I meant alkali metal not alkaline.
     

Share This Page