Chemically pure chloride of potassium is most conveniently prepared from the pure perchlorate by heating it in a platinum basin at the lowest temperature and then fusing the residue in a wellcovered platinum crucible.
In addition, Iraqi attempts to buy ammonium perchlorate, an oxidiser for solid propellant missiles, were successful, at least on paper.
It crystallizes in dark purple-red prisms, isomorphous with potassium perchlorate.
Perchloric acid is best prepared by distilling potassium perchlorate with concentrated sulphuric acid.
Potassium perchlorate, Kcio 4, can be obtained by carefully heating the chlorate until it first melts and then nearly all solidifies again.
Thallous Perchlorate, T1C10 4, and periodate, Tl10 4, are interesting inasmuch as they are isomorphous with the corresponding potassium salts.
The chief insoluble salts are the perchlorate, acid-tartrate and platinochloride.
The fused mass is then extracted with water to remove potassium chloride, and warmed with hydrochloric acid to remove unaltered chlorate, and finally extracted with water again, when a residue of practically pure perchlorate is obtained.