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.
The chief insoluble salts are the perchlorate, acid-tartrate and platinochloride.
Thallous Perchlorate, T1C10 4, and periodate, Tl10 4, are interesting inasmuch as they are isomorphous with the corresponding potassium salts.
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.
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