Potassium periodate

Chemical properties

colourless crystals or white crystalline powder

Physical properties

Colorless tetragonal crystals; density 3.618 g/cm³; melts at 582°C; slightly soluble in water at ordinary temperatures, 0.42 g/100mL at 20°C; moderately soluble in hot water, 4.4 g/100mL at 80°C.

The Uses of Potassium periodate

For the colorimetric determination of Mn (oxidizes manganese compounds to permanganates), as oxidizing agentPotassium periodate is used as an oxidizing agent in organic synthesis and an analytical reagent for the determination of potassium and cerium. It is also used in colorimetric estimation of manganese. It reacts with ammonium cerium(IV) nitrate to prepare tris[trinitratocerium(IV)] paraperiodate which finds application as an oxidant.

The Uses of Potassium periodate

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

What are the applications of Application

Potassium periodate is a useful oxidizing agent and laboratory reagent

Preparation

Potassium periodate can be prepared by oxidation of potassium iodate with a powerful oxidizing agent such as potassium permanganate, chlorine or bromine in basic solution:
IO3ˉ+ Cl₂+ 2OHˉ→IO₄ˉ+ 2Clˉ+ H₂O
Also, the salt may be prepared by electrolysis.

Production Methods

Potassium periodate, KlO4, white solid, formed by electrolysis of potassium iodate under proper conditions.

General Description

Potassium (meta)periodate exhibits strong oxidizing properties in acidic medium.

Hazard

Fire risk in contact with organic materials, strong oxidizing agent. Strong irritant to tissue.

Purification Methods

Crystallise it from distilled water. Its solubility in H2O is 0.2% at 0o, 0.4% at 20o, 4.4% at 80o. and 7.9% at 100o. [Hill Inorg Synth I 171 1939, Schmeisser in Handbook of Preparative Inorganic Chemistry (Ed. Brauer) Academic Press Vol I p 325 1963.]