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Ramium
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Iodine from iodised salt?
I have been wondering if it is possible to extract elemental iodine from iodised table salt . Does anyone know how?
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j_sum1
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I would guess that the quantities involved are extremely small. If I was to attempt it I would bubble Cl2 gas through a brine solution.
But why? You would have much more success extracting from Betadiene. (1%available iodine.) I am not sure that there is any other OTC product that has
higher iodine content.
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Ramium
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How do you extract iodine from betadiene
(And where do you get betadiene)
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Ramium
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Is it possible to do it with no dangerous easy to obtain chemicals
(I am new to chemistry)
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j_sum1
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Betadene is a topical antiseptic otherwise known as povidine iodine. There is a good wikipedia article on it. It is the brown stuff that surgeons
paint on the skin before surgery. It is very widely available. I believe it is the most concentrated otc source of iodine but I may be mistaken. In
any case it would be expensive to produce iodine this way. Much cheaper to buy.
I intend to extract I2 from betadene this week. Sulfuric acid would be easiest bit I will use HCl and an oxidant.
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blogfast25
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More fun: from kelp! Dry kelp, burn it, leach ashes with warm water, evaporate lixiviate to dryness, convert iodides to iodine as per usual.
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Ramium
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Could you describe your kelp method in more detail please
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dermolotov
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Quote: Originally posted by j_sum1  | I would guess that the quantities involved are extremely small. If I was to attempt it I would bubble Cl2 gas through a brine solution.
But why? |
Get a tincture of iodine instead. Evaporate the alcohol and perform the bubbling mentioned. Then sublimate using a tall form beaker covered with a RBF
with ice in it. Scrape off the pure elemental iodine and place in an ampoule.
Tinctures of iodine around around $4 for 25cc. Gram for gram, it's cheaper, easier, quicker, and overall better to extract iodine out of this than
table salt.
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WChase501
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I would agree with the iodine tincture. More cost effective and easier.
"Playing God" is false, Nothing in our Universe is impossible, you just need to know the method of doing whatever you want to. Knowledge is
everything.
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Ramium
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Where do you get iodine tincture and could you please discribe the extraction in more detail
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dermolotov
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I buy these for $5 bucks a shot in my local "Shopper's Drug Mart" in Canada:
http://www1.shoppersdrugmart.ca/en/health-and-pharmacy/every...
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j_sum1
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From a pharmacist or first aid supplier. It is a mixture of iodine and potassium iodide in water and ethanol. I have not seen it for a long time.
Betadine (spelling correct this time) is pretty much universal around here.
Extraction should be straightforward. This is a simple redox reaction. I- is oxidised to elemental iodine.
2I- ==> I2 + 2e-
So you need an oxidiser. Something to use up those electrons. I am going to use acidified potassium chlorate because that's what I have available.
ClO3- + 6H+ + 6e- ==> Cl- +3H2O
(The potassium ions and the anion for the acid are just spectator ions so I have not shown these.)
Other possible oxidisers are sulfuric acid, hydrogen peroxide, chlorine gas or pool chemicals. You could use acidified potassium permanganate but I
won't recommend it since its deep purple colour will disguise the iodine you make. Also, if you use HCl (as I am) you will create some Cl2 gas which
you want to be prepared for. Like I said, sulfuric acid is your best option.
Simply add a few drops of concentrated H2SO4 to your iodine tincture in a test tube and you should see the brown colour disappear and be replaced by
dark crystals that will settle out. Filter your mixture and rinse with water. Put the crystals in the bottom of a beaker and cover with a bowl or
round flask filled with ice. Heat the beaker gently. Your iodine should sublime and recrystallise on the bowl. You can then scrape off your purified
crystals.
After a small practice run, increase the quantity if you like.
The same method applies if you are using potassium iodide, Betadine iodised salt or kelp extract. Yields will be different though since some of these
are more concentrated sources than others.
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j_sum1
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You may be able to buy iodine "water purification tablets" from a camping store. These would work as well.
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Ramium
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Where do you get iodine tincture and could you please discribe the extraction in more detail
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j_sum1
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I thought I just did!
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Nicodem
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Thread Moved
29-12-2014 at 05:02 |
blogfast25
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There are instructables on the net.
Basically quite a lot (a few kg) of kelp is harvested and laid out to dry. It is then burnt inside of a steel bucket or such like and the ashes
gathered. These contain small amounts of KI. Leach out the KI from the ashes with hot water, filter off the water insolubles.
Boil in the filtrate to near dryness. Adding hydrogen peroxide (or other oxidisers) oxidises the iodide to free iodine.
[Edited on 29-12-2014 by blogfast25]
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dermolotov
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lmao.
And I thought I just described where to get it!!
@J_sum1
Ever considered the possibility of bubbling in Chlorine? IMO, that might actually be easier and cheaper albeit a tad more dangerous.
[Edited on 29-12-2014 by dermolotov]
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blogfast25
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| Quote: Originally posted by dermolotov | @J_sum1
Ever considered the possibility of bubbling in Chlorine? IMO, that might actually be easier and cheaper albeit a tad more dangerous.
[Edited on 29-12-2014 by dermolotov] |
You'll form also ICl.
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dermolotov
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Didn't know the simple existence of that. Cheers Blogfast.
So ends the uselessness of formal lab experience. It's a shame they don't work with Chlorine gas in labs anymore...
If Chlorine gas fails to liberate iodine, I guess one could still use Chlorine. Add HCl to make Hydroiodic acid and do a simple oxidation with
chlorate mentioned above. I think this would capture the free iodine as well as the potassium iodine in the tincture.
Otherwise, buy 4 of those 25cc jugs, put them all in a 400cc Beaker, put a 500cc RBF filled with ice on top of it, and sublimate the iodine out. Then
distil off the ethanol and work with the Potassium Iodide that was proposed earlier.
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Ramium
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I am new to chemistry i dont know what the bubbling method is.that is what i ment when i asked for a more detailed description
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blogfast25
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I didn't say that. Cl2 will oxidise iodide to iodine but ICl is a likely by-product. Inter-halogens are common: Cl2 also oxidises bromides but BrCl is
also a by-product.
And of course they still work with chlorine in laboratories.
[Edited on 29-12-2014 by blogfast25]
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Ramium
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I think i will try the kelp method .can you tell me the equations for KI H2O2 reaction
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S.C. Wack
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I suspect that everything about iodine has been covered in other threads, and that the various reactions of iodide and peroxide exist in video form.
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gdflp
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For everyone who is interested in the kelp method : Google Results
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Ramium
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I just got some iodine tincture i plan to extract the iodine by boiling it down to get rid of most of the ethanol and water then adding H2O2 to
convert the iodide to iodine
Do you think this would work
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