Potassium iodide and sodium iodide

[rai]

Greetings to all? I need a chemistry lesson! I want to get potassium iodide or sodium iodide with chemicals that have at home. What I have is: Bromides of sodium and potassium, povidone iodine, ascorbic acid, sodium and potassium carbonate and sodium and potassium hydroxide. After reading a bit out there I've bundled a bit and explained: If ascorbic acid diluted in water and I add povidone-iodine and then I add sodium bicarbonate... sodium iodide would get? Would have the possibility of potassium iodide with what I have? Orry for my English!!! Thanks!!!!

 

[Gerald C Koch]

First question: Why do you need it?

Sorry but it is not possible to do with what you already have. The povidone-iodine complex comes closest but contains other chemicals.

Potassium iodide should be readily available from a local drug store (chemists)

Can you obtain tincture of iodine. Another possibility is decolorized iodine or as it is sometimes called white iodine.

 

[rai]

Yes, if I could get iodine! Why?

 

[Photo Engineer]

Rai, Sodium Iodide is very unstable and is not available commercially in any quantity. If isolated, it goes bad quickly

Potassium Iodide can be extracted (in some cases) from povidone iodine but this is messy and requires special solvents and equipment. You remove the Iodine and get a clear solution of Potassium Iodide if that brand contains Potassium Iodide.

PE

 

[Gerald C Koch]

The solution sold as an antiseptic commonly called "iodine" is a solution of iodine in potassium iodide solution. By adding a dilute solution of potassium sulfite to it until it is just decolorized you have converted all the iodine to potassium iodide.

If you need potassium iodide for emulsion making you really need the pure chemical. Anything else is apt to screw up the emulsion.

 

[rai]

I'm trying to wet collodion and I'm missing potassium iodide, I'll have to wait for my regular supplier ... 10 to 20 days! I thought about the origin of the art and as would be made with chemicals? By the way ... iodides could be changed by other salts? Thank you very much for your help!!!

 

[Photo Engineer]

I'm not sure what you mean by "changed by other salts". Iodides can indeed be changed by inadvertent mixtures and you can thus end up with Iodine, Iodates or perIodates. But this normally does not take place.

PE

 

[falotico]

Try looking at videos on YouTube. There are demos on making KI.