Title: Potassium Periodate
CAS Registry Number: 7790-21-8
Additional Names: Potassium metaperiodate
Molecular Formula: IKO4
Molecular Weight: 230.00
Percent Composition: I 55.18%, K 17.00%, O 27.83%
Line Formula: KIO4
Literature 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.
Melting point: mp 582°
Density: d415 3.618
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. |