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Solubility for Oxides and Hydroxides

  1. Sep 16, 2010 #1
    Does anyone know any list of oxides or hydroxides that are soluble in water?


    If the term 'tetrahedral' means being bonded to 4 other atoms, are there other terms that mean being bonded to 3 atoms, 2 atoms, etc.?

  2. jcsd
  3. Sep 16, 2010 #2


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    Science Advisor

    The CRC handbook, for one.

    No, it does not. Tetrahedral means tetrahedral, i.e. sharing some property in common with a tetrahedron, a geometric object.
    A methane molecule is tetrahedral because the four hydrogen atoms are located at the corners of a tetrahedron.

    See also "point groups".
  4. Sep 16, 2010 #3


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    Staff: Mentor

    You are aware of the fact that solubility is not a TRUE/FALSE property? All hydroxides are to some extent soluble (especially if you are ready to accept fact that 10-10 g/L means that something has dissolved).
  5. Sep 16, 2010 #4
    As far as your second question, you might want to google molecular geometry. That might be what you were wondering about.
  6. Sep 18, 2010 #5
    Thanks for the second qns.

    From the Internet, I have checked that all oxides are insoluble except calcium (sparingly), barium and Group 1 metals while all hydroxides are insoluble except ammonium, barium and Group 1 metals. (All this are based on the GCSE 'O' Level Syllabus). But the problem is, sulphur trioxide, a nonmetal oxide, is soluble in water to form sulfuric acid, so the qns is:

    Are all nonmetal oxides soluble in water to form acids?
  7. Sep 18, 2010 #6


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    Staff: Mentor

    You may safely assume most oxides are insoluble - if they dissolve, that means they react with water. Product of the reaction can be either base or acid, depending on the oxide.
  8. Sep 18, 2010 #7
    Google VSEPR Theory.
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