7654. Potassium Periodate

Nomenclature

CAS number: 7790-21-8
Periodic acid (HIO4) potassium salt (1:1); potassium metaperiodate.
IKO4; mol wt 230.00.
I 55.18%, K 17.00%, O 27.83%.
KIO4.

Description and references

Prepd by oxidizing potassium iodate with chlorine in alkaline soln: Hill, J. Am. Chem. Soc. 50, 2678 (1928); Inorg. Synth. 1, 171 (1939).

Properties

Colorless tetragonal crystals, d415 3.618. mp 582°. Soly in water (g/100 g H2O): 0.168 at 0°; 0.42 at 20°; 0.93 at 40°; 2.16 at 60°; 4.44 at 80°; 7.87 at 100°; also given as 0.66 at 13°. Sparingly sol in aq KOH.

Caution

Highly irritating to skin, eyes, mucous membranes.

Use

Powerful oxidizer in acid soln, oxidizing manganese compds to permanganate; used for this purpose in analytical chemistry (colorimetric estimation of Mn), also for the oxidation of some organic compds.