CAS 7681-11-0 Potassium iodide - Materials / Alfa Chemistry

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Potassium iodide

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Catalog Number

ACM7681110

CAS Number

7681-11-0

Product Name

Potassium iodide

Structure

Category

Electrolytes

Synonyms

Potassium monoiodide

Description

Potassium iodide is an inorganic compound with the chemical formula KI. This white salt is the most commercially significant iodide compound, with approximately 37,000 tons produced in 1985. It is less hygroscopic (absorbs water less readily) than sodium iodide, making it easier to work with. Potassium iodide occurs naturally in kelp. Kelp’s iodide content can range from 89 µg/g to 8165µg/g.Aged and impure samples are yellow because of the slow oxidation of the salt to potassium carbonate and elemental iodine.Potassium iodide is medicinally used for thyroid blockade, thyroid storm and also as an expectorant. It is on the WHO Model List of Essential Medicines, the most important medications needed in a basic health system.

IUPAC Name

Potassium;iodide

Molecular Weight

166.003

Molecular Formula

Canonical SMILES

[K+].[I-]

InChI

InChI=1S/HI.K/h1H;/q;+1/p-1

InChI Key

NLKNQRATVPKPDG-UHFFFAOYSA-M

Boiling Point

184 °C

Melting Point

681 °C

Flash Point

1330 °C

Purity

99%+

Density

1.7 g/cm³

Solubility

Slightly soluble in ethanol

Appearance

Yellow crystals

Application

Potassium iodide serves multiple critical purposes, primarily as a source of iodine essential for maintaining thyroid health and preventing disorders such as goiter. It is utilized as a supplement in table salt and animal feed to address iodine deficiencies. In medical contexts, potassium iodide plays a pivotal role in regulating thyroid function and is used to protect the thyroid gland from radioactive iodine exposure following environmental contamination by iodine-131. This compound also finds applications in photography, particularly in the production of photographic emulsions and processes, due to its ability to dissolve iodine and form the triiodide ion. Additionally, it is an essential analytical reagent, used in animal chemistry, and offers therapeutic benefits as a radical scavenger, expectorant, and treatment for conditions like sporotrichosis, erythema nodosum, and nodular vasculitis. Its versatility and effectiveness across various fields underscore its significance as an indispensable chemical compound.

Storage

2-8 °C

Color/Form

Colorless or white, cubical crystals, white granules, or powder;HEXAHEDRAL CRYSTALS, EITHER TRANSPARENT OR SOMEWHAT OPAQUE

Complexity

Covalently-Bonded Unit Count

EC Number

231-659-4

Exact Mass

165.86818

Formal Charge

Hazard Class

Heavy Atom Count

Log P

-2.99600

MDL Number

MFCD00011405

MeSH Entry Terms

Antistrumin;Iodide, Potassium;Ioduro Potasico Rovi;Iosat;Jod beta;Jodetten Henning;Jodgamma;Jodid;Jodid dura;Jodid Hexal;Jodid ratiopharm;Jodid Verla;Jodid-ratiopharm;Mono Jod;Mono-Jod;Pima;Potassium Iodide;SSKI;Thyro Block;Thyro-Block;Thyroprotect

Monoisotopic Mass

165.86818

NSC Number

77362

Odor

Odorless

Other Experimental

Slightly deliquescent in moist air; on long exposure to air becomes yellow due to liberation of iodine, small amount of iodate may be formed; light and moisture accelerate the decomposition; aqueous solution becomes yellow in time due to oxidation, but a small amount of alkali prevents it;30 g KI with 21 mL water gives 30 mL of a saturated solution at 25 °C;Slightly hygroscopic in moist air;Readily dissolves elemental iodine /Potassium iodide solution/

Refractive Index

1.677

Rotatable Bond Count

Stability

Stable. Protect from light and moisture. Incompatible with strong reducing agents, strong acids, steel, aluminium, alkali metals, brass, magnesium, zinc, cadmium, copper, tin, nickel and their alloys.

Storage Conditions

Store at RT.

Topological Polar Surface Area

0 Å²

UNII

1C4QK22F9J

Vapor Density

Vapor Pressure

0.31 mm Hg ( 25 °C)

WGK Germany

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