[niertap]

i need some help makeing the crystilin monohydrate or concentrated perchloric acid of the anhydrous or dihydrate varity (are there any others?). I'm gussing you just add some potassium perchlorate to some sulphuric acid or hydrochloric acid. Chilled or heated idk.

[woelen]

Adding potassium perchlorate to an aqueous solution, like hydrochloric acid, does not work. KClO4 is only very sparingly soluble and derived salts, such as KCl are much more soluble.

Adding KClO4 to conc. H2SO4 may work, if the liquid is distilled at low pressure and slight heating, but this process is VERY dangerous. Anhydrous or highly concentrated perchloric acid is an insanely dangerous compound, which explodes on contact with organics and is exceedingly corrosive. This experiment can only be conducted in a specially prepared fume hood, which is inert towards perchloric acid and which does not contain materials which can absorb any condensed vapor of perchloric acid. Even with this kind of precautions there always is a high risk of explosion.

[niertap]

if i had close to 100% h2so4 and added the kclo4 would the kso4 settle out or effect it much? also, how is it made into the crystilin monohydrate?

[woelen]

If you mix H2SO4 and KClO4 you get a mess. You need to distill this mix in order to obtain HClO4. It definitely does not nicely separate, such that you can decant the HClO4. You really need to distill and that is dangerous like hell .