Potassium periodate Chemical Properties

Melting point:

582 °C

Boiling point:

explodes [HAW93]

Density 

3.618

vapor density 

7.9 (vs air)

storage temp. 

2-8°C

solubility 

H₂O: 0.01 M at 20 °C, clear, colorless

form 

Powder/Solid

color 

White to off-white

Specific Gravity

3.618

PH

pH (5g/l, 25℃) : 4.5～5.5

Odor

Odorless

PH Range

4.5 - 5.5

Water Solubility 

0.42 g/100 mL (20 ºC)

Merck 

14,7654

crystal system

square

Space group

I41/a

Lattice constant

a/nm	b/nm	c/nm	α/o	β/o	γ/o	V/nm3
0.5726	0.5726	1.2607	90	90	90

Stability:

Stable. Strong oxidizer - contact with combustible materials may cause fire. Incompatible with organic material, combustible material, strong reducing agents, powdered metals.

CAS DataBase Reference

7790-21-8(CAS DataBase Reference)

EPA Substance Registry System

Periodic acid (HIO4), potassium salt (7790-21-8)

Safety Information

Hazard Codes 

O,Xi

Risk Statements 

8-36/37/38

Safety Statements 

17-26-36-37/39

RIDADR 

UN 1479 5.1/PG 2

WGK Germany 

3

F 

3

TSCA 

Yes

HazardClass 

5.1

PackingGroup 

II

HS Code 

28299000

MSDS

• Language:English Provider:Periodic acid potassium salt
• Language:English Provider:SigmaAldrich
• Language:English Provider:ACROS
• Language:English Provider:ALFA

Potassium periodate Usage And Synthesis

Description

Potassium periodate (chemical formula: KIO4) is a kind of inorganic salt composed of a potassium cation and a periodate anion. It can be used for the determination of potassium and cerium owing to its low solubility of KIO4. It can be used an oxidizing agent, and as a source of oxygen. It can also be used for the determination of the concentration of other compounds through measuring the reaction between DPC (sc-202590) and KIO4. It can be synthesize through the oxidation of potassium iodate through chlorine and potassium hydroxide, or by the electrochemical oxidation of potassium iodate.

References

https://www.scbt.com/scbt/product/potassium-periodate-7790-21-8
https://en.wikipedia.org/wiki/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.

Uses

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.

Uses

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.

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.]

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