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Ionic and Covalent forms Of AlCl3

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    Ionic and Covalent forms Of AlCl3

    Are Ionic and Covalent Aluminium chlorides two different substances with different structures or is it the same compound having properties of both Ionic and covalent substances? I am a little confused http://www3.pak.org/gupshup/smilies/confused.gif
    Is the dimer of AlCl3 (Al2Cl6) the covalent form of Aluminium Chloride?

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    #2
    oh what ever http://www3.pak.org/gupshup/smilies/tongue.gif

    No more chemistry for me!

    [This message has been edited by who---me (edited June 11, 2001).]

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      #3
      I held the same thought until I came across the following question:
      Draw the structures of:
      i)Ionic Aluminium Chloride
      ii)Covalent Aluminium Chloride (2 marks each)

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        #4
        Yes, the dimer is the covalent form. In fact, this question is a gross oversimplification of the true situation - should you take chemistry further than your level,you'll realise the tru nature of bonding in AlCl3.....

        anyway, covalently is, in the solid and liquid phase,

        Cl . .Cl . Cl
        . \ ./ .\ /
        . .Al . Al
        . / .\ ./ \
        Cl . .Cl . Cl

        (ignore the dots.... they are there only to get the formatting right in gupshup)

        In the gas phase it is

        . .Cl
        . .|
        . .Al
        . / .\
        Cl . Cl

        (ignore the dots.... they are there only to get the formatting right in gupshup)


        Hmmm about the ionic aluminium chloride, I can't help you (you know, AlCl3 is in reality mainly covalent!!!!!!!)

        I suppose you just draw it a like any other ionic compound. So you draw an aluminium ion with 3 chloride ions around it or something, I guess.

        [This message has been edited by mAd_ScIeNtIsT (edited June 11, 2001).]
        Muslims are so good at dividing that they can divide the atom. If you see two Muslims, probably they belong to 3 parties.
        Al-Ghazali

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          #5
          Hmmm dont know for sure if this answers your question

          but wont the ionic form be in a latice structure while the covalent bonds would be as molecules. In the first case there would be a cloud of electrons holding the structure together while in the melcular form there would only be single moelcules of AL and Cl.

          Lemme know if that sounds right.

          Comment


            #6
            Just a tip.. when you have to draw something like this, use the [ code ] tag:

            For instance:

            Code:
            Cl    Cl   Cl
              \  /  \ /
               Al   Al 
              /  \  / \
            Cl    Cl   Cl

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              #7
              Hmm.. So which form is more abundant in nature? I was told (by my chemistry teacher) that the dimer dissociates on its formation to form alcl3 again hence Al2Cl6 is unstable and rarely found...

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                #8
                Whoops I was getting confused with organometallic Al compounds

                Here's what my textbook says

                Aluminium halides are dimers in the gas phase; aluminium chloride, for example, has molecular formula Al2Cl6 in the vapor.

                Sorreeeeeeeeee

                Man, I'm gonna do badly in exams.......

                [This message has been edited by mAd_ScIeNtIsT (edited June 13, 2001).]
                Muslims are so good at dividing that they can divide the atom. If you see two Muslims, probably they belong to 3 parties.
                Al-Ghazali

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                  #9
                  Al2Cl3 http://www3.pak.org/gupshup/smilies/confused.gif ..... I am sure thats a typo.....

                  anyway
                  here are the structures
                  AlCl3:
                  http://www2.paklinks.com/gupshup/gallery3/AlCl3.gif

                  Blue lines are Ionic Bonds

                  Al2Cl6:
                  http://www2.paklinks.com/gupshup/gallery3/Al2Cl6.gif

                  Yellow lines here donate coordinate bonds (electron sharing). This gives the atom covelency....
                  This should be correct as I copied it from Philip Matthews http://www3.pak.org/gupshup/smilies/smile.gif

                  hang on!! Yur at O'levels right? I didont remember such detail then!

                  Comment


                    #10
                    Thanx for the info guys

                    Who---me: I happen to have completed my O's, just brushing up for the next level. And yes, this detail was included in our O levels.

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