[Kinkerz]

(Original post by Malsi101)
I have no idea what happens with alcohols and H2SO4 (conc)!



I know what happens with H2SO4 and halide ions though

I'll give you an example:

CH₃CH(OH)CH₂CH₃ + H₂SO₄ --> H₂C=CHCH₂CH₃ + H⁺

You get an elimination of the alcohol group to form an alkene. It's a dehydration reaction.


What happens with halides and H₂SO₄ then?

[Malsy]

(Original post by Kinkerz)
I'll give you an example:

CH₃CH(OH)CH₂CH₃ + H₂SO₄ --> H₂C=CHCH₂CH₃ + H⁺

You get an elimination of the alcohol group to form an alkene. It's a dehydration reaction.


What happens with halides and H₂SO₄ then?

oh yeah darn it sorry!

erm i don't really know except some reductions

[Kinkerz]

(Original post by Malsi101)
oh yeah darn it sorry!

Woah! Don't be sorry.

(Original post by Malsi101)
erm i don't really know except some reductions

You get some redox products and have to be able to write half-equations for 'em, no? We did.

I.e. with I^-, you get four redox products of SO₂, S, H₂S and I₂.

[Malsy]

Yeah

2HI + H2S04 ----> I2 + SO2 + 2H20
6HI + SO2-----> H2S +3I2 + 2H20

[Kinkerz]

(Original post by Malsi101)
Yeah

2HI + H2S04 ----> I2 + SO2 + 2H20
6HI + SO2-----> H2S +3I2 + 2H20

We used to do it like:

2I^- --> I₂ + 2e^-
H₂SO₄ + 8e^- + 8H⁺ --> H₂S + 4H₂O

8I^- + H₂SO₄ + 8H⁺ --> H₂S + 4H₂O + 4I₂

Or have I been stupid and made a sleepy mistake?

[Malsy]

(Original post by Kinkerz)
We used to do it like:

2I^- --> I₂ + 2e^-
H₂SO₄ + 8e^- + 8H⁺ --> H₂S + 4H₂O

8I^- + H₂SO₄ + 8H⁺ --> H₂S + 4H₂O + 4I₂

Or have I been stupid and made a sleepy mistake?

yh i should really do it that way

is both right?
i never know what they want

[Kinkerz]

(Original post by Malsi101)
yh i should really do it that way

is both right?
i never know what they want

I think both are right.

Though I will say I've never seen SO₂ being reduced to H₂S by HI/I^-. Might have to wait for Devil Eggs to sort it out tomorrow!

[Malsy]

(Original post by Kinkerz)
I think both are right.

Though I will say I've never seen SO₂ being reduced to H₂S by HI/I^-. Might have to wait for Devil Eggs to sort it out tomorrow!

well there are still Halide ions in the HI aint there?

yes wait for EVS

[Malsy]

(Original post by Kinkerz)
I think both are right.

Though I will say I've never seen SO₂ being reduced to H₂S by HI/I^-. Might have to wait for Devil Eggs to sort it out tomorrow!

LOL ...just realised it's practically the SAME thing as in

HI = H+ and I- ions
HBr= H+ and Br- ions

[Kinkerz]

(Original post by Malsi101)
well there are still Halide ions in the HI aint there?

Yeah. HI = I^- in this instance.

It's just the SO₂ in lieu of H₂SO₄ I've never seen.

Edit: It's just I^- is the ionic notation and I think it makes writing half-equations easier.

[Kinkerz]

(Original post by Malsi101)
LOL ...just realised it's practically the SAME thing as in

HI = H+ and I- ions
HBr= H+ and Br- ions

Yeah it's just writing it as the halide ion makes it easier to consrtuct a half-equation. I find it does, anyway!

[Malsy]

(Original post by Kinkerz)
Yeah it's just writing it as the halide ion makes it easier to consrtuct a half-equation. I find it does, anyway!

I will start doing it this way.
Not much of a difference to remember really!!

[EierVonSatan]

(Original post by Kinkerz)
I think both are right.

Though I will say I've never seen SO₂ being reduced to H₂S by HI/I^-. Might have to wait for Devil Eggs to sort it out tomorrow!

Looks good

[Malsy]

Howdy people...

[Kinkerz]

(Original post by EierVonSatan)
Looks good

Awesome.

(Yes! Quoting you has now given me the "" smiley. I've been wanting the 'password' for that for a while Could never find it.)

[Malsy]

(Original post by Kinkerz)
Awesome.

(Yes! Quoting you has now given me the "" smiley. I've been wanting the 'password' for that for a while Could never find it.)

If you just move your cursor over smilies you get the code.

[Kinkerz]

(Original post by Malsi101)
If you just move your cursor over smilies you get the code.

Haha. Damn. I also never knew that!

[Malsy]

(Original post by Kinkerz)
Haha. Damn. I also never knew that!

Now you do.

[Mathematician!]

(Original post by Malsi101)
Now you do.

Wait, there is a Chemistry society and you didn't think of automatically adding me!? I am offended!

[Kinkerz]

(Original post by Mathematician!)
Wait, there is a Chemistry society and you didn't think of automatically adding me!? I am offended!

How did your January chemistry exams go Mathematician?