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Halogens in water and cyclohexane?

amaranthine

4

Anybody help with wat the eqautions are for Bromine/Chlorine/Iodine water with cyclohexane? It's much appriciated!

Reply 1

amaranthine

OP

4

Oh and what are the precipitates being formed?

Reply 2

Calumcalum

14

Maybe the halogen (Br/Cl/I) atoms take the place of the hydrogens in cyclohexane? Couldn't be sure though...

Reply 3

yesioo

15

In cyclohexane, iodine is purple, bromine is a strong orange/yellow and chlorine is pale yellow.

Reply 4

yesioo

15

I just copied it from the book *shrug*.

Reply 5

Chrrams

It would have to be in the presence of UV light surely... free radical substitution? I don't know if this is possible or not, as cyclohexane is very inert. Only really reacts with Superacids like Fluoroantimonic Acid.

If substitution can occur, which I doubt, then:

C6H12 + Cl2 -> C6H11Cl + HCl

Further substitution would occur, leading to C6H6C6 eventually:

C6H12 + 6Cl2 -> C6H6Cl6 + 6HCl

Same reactions with Br2 and I2.

I can repost with initiation, propogation and termination if you like. But bear in mind that this would only occur in quite harsh conditions (eg very hot, high intensity UV light)...

Reply 6

yesioo

15

[QUOTE]
well yeh they're pretty much the same as what i said. meh.[/QUOTE
:laughing: fair enough. :smile:

Reply 7

Ziffachan

2

Halogens don't react with cyclohexane (not at room temperature anyway), they only mix with it. If you add cyclohexane to chlorine/bromine water or iodine solution and shake it, the halogen dissolves in the cyclohexane layer because the halogen and the cyclohexane have the same intermolecular forces (instantaneous dipole-induced dipole).

Reply 8

amaranthine

OP

4

Im so confused, we just mixed together halogens in water and in cyclohexane and we have to include the equations for it in a presentation we have to make.

Reply 9

amaranthine

OP

4

so what is the precipitate? I'm going to fail chemistry!

Reply 10

EmpMartinIV

we just mixed together halogens in water and in cyclohexane.

And? What did you see?

Reply 11

amaranthine

OP

4

Chlroine water had like a white top layer, Bromine had a dar yellow top layer and Iodine just went reddy/brown

Reply 12

amaranthine

OP

4

i dont know what to do becuase my results are well out what they are supposed to be but everyone else in my class got the same.

Reply 13

Ziffachan

2

I've done the same thing (if you're doing salters). Mixing chlorine/bromine/iodine water simply shows that halogens are more soluble in cyclohexane than in water, there is not a reaction.

Reply 14

301lw

Original post by Chrrams

It would have to be in the presence of UV light surely... free radical substitution? I don't know if this is possible or not, as cyclohexane is very inert. Only really reacts with Superacids like Fluoroantimonic Acid.

If substitution can occur, which I doubt, then:

C6H12 + Cl2 -> C6H11Cl + HCl

Further substitution would occur, leading to C6H6C6 eventually:

C6H12 + 6Cl2 -> C6H6Cl6 + 6HCl

Same reactions with Br2 and I2.

I can repost with initiation, propogation and termination if you like. But bear in mind that this would only occur in quite harsh conditions (eg very hot, high intensity UV light)...

two layers form when a halogen and cyclohexane react
what actually is the bottom layer?
reply asap please, my salters isa is tomorrow :l

Reply 15

BlackLipBastard

Original post by amaranthine

Anybody help with wat the eqautions are for Bromine/Chlorine/Iodine water with cyclohexane? It's much appriciated!

Sorry for the late reply. Anynway in cyclohexane, Chlorine is pale-green, bromine is orange, iodine is violet

Reply 16

Jess_Olivia

we did that exact experiment today with the halogens and cyclohexane with water and then writing up the powerpoint for the OCR B salters course - although i have no idea what is supposed to go in it -.-

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Reply 17

JamFlan

1

Sorry amaranthine, I hope it's not too late. But I actually have no idea

Reply 18

username3249896

12

Original post by JamFlan

Sorry amaranthine, I hope it's not too late. But I actually have no idea

It's actually quite too late. You are 9 years late