[cliverlong]

Hi,

More Group 7 (17) chemistry questions.

Say chlorine is bubbled through aqueous solutions of sodim bromide and sodium iodide salts.

The chlroine displaces the other two halides which go into aqueous solution. I have read that to remove the bromine or iodine one shakes the solution with a non-polar solvent.

1) In what form are bromine and iodine in aqueoue solution? Diatomic molecules?

2) What is the (main) cause of the bromine and iodine passing into the non-polar solvent?

3) What would be a suitable non-polar solvent? Octane? Benzene? Tetrabromomethane?



Thanks

Clive

[Rabn]

I'm curious what you mean when you say that the "chlorine displaces the other two halides".  Please explain.

[cliverlong]

I'm curious what you mean when you say that the "chlorine displaces the other two halides".  Please explain.

2NaBr(aq) + Cl₂(g) --> 2NaCl(aq) + Br₂(aq)
2NaI(aq) + Cl₂(g) --> 2NaCl(aq) + I₂(aq)

[ARGOS++]

Dear cliverlong;

1.)   You’re right.
2.)   Diatomic molecules are non-polar, even if the are highly electronegative.
3.)   All your solvents should do it with more or less success.

Apropos:  Polar/Nonpolar and Iodine
Did you know that you can easy “semi quantitative measure” the polarity of solvents, if you use the color of a diluted solution of Iodine in the particular solvent?:

         Nonpolar   -----------------------   Medium    -----------------------   Polar
         Violet       -----------------------      Red      -----------------------  Yellow


Good Luck!
                    ARGOS⁺⁺

[benj]

hmm..chlorine is above the other two(Br and I) in the group 17 elements, thus its more reactive and it is very much capable of kicking off the other two.
   in the solution, bromine and iodine are diatomic,and since its diatomic (two moles of the same element in a bond = equal electronegativity = 0 dipole moment) its non-polar. logically, it will dissolve better in a non-polar solution than in a polar one (like dissolves like), which means when you mixed a non-polar solvent to your solution (of NaCl,Br₂,and Cl₂), you're actually exrtacting the Br₂ and Cl₂) from it.
   i think all the non-polar solvents you gave are suitable solvents.