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JJay
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Cheap Potassium Iodide
I just ran across some cheap potassium iodide and thought people might be interested: https://www.ebay.com/itm/100g-3-52oz-Pure-Potassium-Iodide-C...
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Sulaiman
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Thanks
Even though I still have c50g I could not resist buying 100g at that price.
... stock up, be ready for the next nuclear event .......... 
For similar reasons I also have excess stock of iodine prills.
... I now need to do lots of iodine based chemistry ...
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JJay
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I considered buying a kilogram but placed a small order for only 500 grams instead. Potassium iodide is expensive... 500 grams is only about 3 moles.
Still, that's one of the best prices I've seen.
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Ubya
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bought 100g just for the price, at the moment i don't have to use it
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highpower48
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Only problem I see is a 98% seller rating. I just got burned on an order of resistors. This is the first time that I was attempted to be scammed on
eBay. I did recieve my money back, through eBay. But now I have to find another dealer who has 5watt resistors and reorder. The bad dealer had a
rating of 99.3%.
I would love to get a couple of 100 grams of potassium iodide to make elemental iodide but this one seems just to good to be true.
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CobaltChloride
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I bought some KI from such a seller on eBay and the chemical didn't have any problems. I bought my 100g of KI from here: https://www.ebay.com/itm/100g-3-52oz-Pure-Potassium-Iodide-C...
It doesn't seem to contain any other halogens besides iodine. I combined a bit of the KI and some oxone (in excess) in a test tube, added a bit of
water and I didn't get any brown or yellow-green fumes, just some black solid and a bit of purple vapor afterwards.
The only problem with this KI is that it is slightly wet and sticks to its container. This can be solved by putting the KI in a dessicator for a few
days.
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JJay
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Quote: Originally posted by CobaltChloride  | I bought some KI from such a seller on eBay and the chemical didn't have any problems. I bought my 100g of KI from here: https://www.ebay.com/itm/100g-3-52oz-Pure-Potassium-Iodide-C...
It doesn't seem to contain any other halogens besides iodine. I combined a bit of the KI and some oxone (in excess) in a test tube, added a bit of
water and I didn't get any brown or yellow-green fumes, just some black solid and a bit of purple vapor afterwards.
The only problem with this KI is that it is slightly wet and sticks to its container. This can be solved by putting the KI in a dessicator for a few
days. |
Now that is a good price. I plan on testing mine when it arrives, and I will of course demand my money back if it isn't reasonably good quality.
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woelen
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Some time ago, I ordered 300 grams of this seller and I am happy with the stuff. For just over EUR 15 I have 300 grams of decent quality KI, which is
a very good price.
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happyfooddance
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Shipping says estimated 6 weeks 
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Tdep
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I might grab some too, good link thanks. But yeah, good thing I don't want it urgently, the shipping estimate to Aus is 7-12 weeks wow
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woelen
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Oh yes, shipping takes a loooooooong time. Just order it now and slooooowly think of any nice experiments you will do with it when it arrives 
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Sulaiman
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Received today, 95g KI
The KI arrived this morning, it looked a little damp and felt underweight.
The KI that arrived weighed 95.55g but actually weighed 95.07g after drying,.
5% underweight... OK for the price if it is pure KI ... tbd.
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Tdep
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So I ordered some of this potassium iodide. Its only $6!
It took a while to turn up. And when it did arrive, it is completely unlabelled. Sure fine, it was free shipping.
Its got some yellow spots through it. Faint, but they're there. Fine, that's okay, i'll do a recryst, it was only $6.
It also has a mild unpleasant smell. Very mild, but its there. Whatever, it'll come out in the recryst.
Have I put up with too much? Well, this is where I draw the line: it isn't even potassium iodide. Now that's not fine, even if it was only $6!
I'm trying to titrate my ozone generator. Get out the new KI, make a standard solution, run it.... nothing. Add some other (more expensive) NaI...
instant reaction! Do it some more, run the ozone through a conc solution of the new, now unknown salt.... nothing. I can say with complete confidence
that I have been sold a highly soluble salt that does NOT contain the iodide ion in any concentration.
Looking at it now I can feel it is not dense enough.
Oh well, guess I only tipped $6 down the drain....
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DavidJR
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I forgot to report back on this. I also ordered from this listing. I tried to use this new KI for peroxide testing of ethers but I didn't get any
reaction to my hydrogen peroxide control sample. I tried the exact same technique with known-good KI and it worked fine.
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JJay
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I never actually got mine... they canceled my order and refunded my money.
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Ubya
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well, i got mine and did not test it, if many here received something other than iodide i should really test it
[Edited on 26-11-2018 by Ubya]
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woelen
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This is sad to read. I ordered 300 grams from this seller (or a similar one, that may be the catch) and I had good experience with it (like
CobaltChloride). I tested it immediately on arrival by taking some of the salt, dissolving it in dilute HCl and added a little 10% H2O2. I immediately
got a grey precipitate of iodine in this reaction. So, apparently the sellers have different batches, some of them being OK, others not OK. This is
the risk of buying cheap stuff from China. Up to now I have been lucky with chems from China, with electronics I once had inferior components, with
lower gain and inferior parameters (e.g. transistors with low beta-factor and higher than tolerated resistance).
Half a year ago I also purchased 250 grams of elemental iodine from China for a little over EUR 20 with free shipping. I received it in a plastic
brown bag, which was wrapped in another vacuum sealed bag, made of laminated plastic/aluminium. The iodine was fine though, I rebottled it. It leaves
no residue on strong heating.
If you don't get what you pay for you either get a refund from the seller, or from eBay.
JJay's link and CobaltChloride's link are different. Could that be the difference in experiences?
[Edited on 26-11-18 by woelen]
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DavidJR
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| Quote: Originally posted by woelen |
If you don't get what you pay for you either get a refund from the seller, or from eBay.
JJay's link and CobaltChloride's link are different. Could that be the difference in experiences?
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To clarify I ordered from JJay's link.
The problem with getting refunds is that often when it arrives from China after a couple of months, I don't have time to test it right away, so by the
time I realise it's fake, it's too late.
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Loptr
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I also ordered from JJay's link and received my order fairly quickly. This was very early on, about as soon as I saw this thread. I just stowed it
away in the back of my cabinet, but now I am thinking I need to test it.
"Question everything generally thought to be obvious." - Dieter Rams
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Sulaiman
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I have just returned from my lab after quickly testing a sample of my 100g ... pass
Solubility was indistinguishable from a known good sample, side-by-side.
I diluted the two samples then adding drops of silver nitrate solution alternately to each sample produced similar light yellow 'clouds'
If it is not KI then it is an excellent fake.
I've not tested the purity.
EDIT: Yes, I am dumb ... after reading posts below I realiseded that even sodium chloride would give a similar result.
I'll try to test it properly tomorrow.
[Edited on 27-11-2018 by Sulaiman]
CAUTION : Hobby Chemist, not Professional or even Amateur
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DavidJR
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I just tested mine again:
Flame colour reveals definite presence of sodium.
Dissolution of a spatula full in 15ml UP water, acidification with a small amount of HNO3, and addition of 1ml 0.1N AgNO3
gives a white precipitate. This precipitate dissolves on addition of a few ml of conc. NH3
So. I've been sent some expensive table salt.
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JJay
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I would be furious. Sorry about that; I just thought the price was really good. Definitely request a refund....
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Ubya
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i'm really mad, it's not iodide, and it's not even a potassium salt, just sodium, most probably just fking table salt...
man i'm mad. fuck
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WGTR
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I’m guessing that y’all got sent iodized salt, at best.
[Edited on 11-26-2018 by WGTR]
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JJay
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Definitely contact eBay and/or the seller and complain. I don't know the seller and am not affiliated with them in any way (and they refunded my
money), but if they are scamming people, they should be required to make amends and stop.
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