[frankz81]

hi all, firstly my chemistry knowledge is only just at yr 12 level so please elbaorabate a lil more than u would.
i have an anti rot solution, the phosphorus in it is 460g/l in 500g with potassium.
i have 2 questions, i believe the best way to etract the phos out of it is to heat , freeze, filter and continue til no more potassium salt precipitates. that was fine, but does hp303 react with i2 on its own or do u need hp302 to react with it?
also once the salt is all out, do u evaporate on low heat to reduce to a syrupy/viscous solution? i ask as i have seen h3po2 and it was a liquid and crystal clear. during the process, the solution turned yellowish, is this correct? some help needed please for a newbie.

[eugenedakin]

Hi frankz81,

Lets go through this step-by-step, as I am a little confused about your question.

First, could you tell me what the chemical formula is of the salt you want to precipitate? Is hp303 or hp302 a suppliers name for the product?

Thanks for your help,

Eugene