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Potassium iodide

Chemical Name:
Potassium iodide
Molecular Formula:
Molecular Weight:
MDL Number:
MOL File:
MSDS File:
Last updated:2024-06-25 20:17:06

Potassium iodide Properties

Melting point 681 °C (lit.)
Boiling point 184 °C(lit.)
Density 1.7 g/cm3
vapor density 9 (vs air)
vapor pressure 0.31 mm Hg ( 25 °C)
refractive index 1.677
Flash point 1330°C
storage temp. 2-8°C
solubility H2O: 1 M at 20 °C, clear, colorless
form particles (round)
pka 0.06[at 20 ℃]
Specific Gravity 3.13
color Yellow
PH 6.0-9.0 (25℃, 1M in H2O)
Odor odorless
Water Solubility 1.43 kg/L
Sensitive Hygroscopic
Merck 14,7643
Dielectric constant 5.1200000000000001
Exposure limits ACGIH: TWA 0.01 ppm
BCS Class 1
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.
LogP -0.958 at 25℃
FDA 21 CFR 172.375; 184.1634; 582.5634; 310.503; 310.545; 558.258; 582.80
Substances Added to Food (formerly EAFUS) POTASSIUM IODIDE
SCOGS (Select Committee on GRAS Substances) Potassium iodide
CAS DataBase Reference 7681-11-0(CAS DataBase Reference)
EWG's Food Scores 2
ATC code R05CA02,S01XA04,V03AB21
NIST Chemistry Reference Potassium iodide(7681-11-0)
EPA Substance Registry System Potassium iodide (7681-11-0)


Risk and Safety Statements

Symbol(GHS)  GHS hazard pictograms
Signal word  Warning
Hazard statements  H315-H319
Precautionary statements  P305+P351+P338
Hazard Codes  Xn
Risk Statements  26
Safety Statements  22-36/38
WGK Germany  1
RTECS  TT2975000
HS Code  28276000
Toxicity Approx LD i.v. in rats: 285 mg/kg (Hildebrandt)
NFPA 704
1 0

Potassium iodide price More Price(145)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich PX1507 Potassium iodide granular, Meets ACS Specifications GR ACS 7681-11-0 125g $76.2 2024-03-01 Buy
Sigma-Aldrich PX1507 Potassium iodide granular, Meets ACS Specifications GR ACS 7681-11-0 500g $244 2024-03-01 Buy
Sigma-Aldrich SAB2500833 Anti-PSME3 antibody produced in goat affinity isolated antibody, buffered aqueous solution 7681-11-0 100μG $568 2024-03-01 Buy
Sigma-Aldrich PX1507 Potassium iodide granular, Meets ACS Specifications GR ACS 7681-11-0 2.5kg $778 2024-03-01 Buy
Sigma-Aldrich PX1507 Potassium iodide granular, Meets ACS Specifications GR ACS 7681-11-0 12kg $3410 2024-03-01 Buy
Product number Packaging Price Buy
PX1507 125g $76.2 Buy
PX1507 500g $244 Buy
SAB2500833 100μG $568 Buy
PX1507 2.5kg $778 Buy
PX1507 12kg $3410 Buy

Potassium iodide Chemical Properties,Uses,Production

Chemical Properties

Potassium iodide is a white crystals, granules, or powder; strong, bitter, saline taste. becomes yellowish when exposed to bright light due to photochemical decomposition liberating traces of free iodine. Soluble in water, alcohol, acetone, and glycerol. slightly soluble in ether and ammonia. It may be prepared bythe reaction of iodine with hot potassiumhydroxide solution followed by separation from the iodate (which isalso formed) by fractional crystallization. In solution it has the interestingproperty of dissolving iodine to formthe triiodide ion I3-, which is brown. Potassium iodide is widely used as ananalytical reagent, in photography,and also as an additive to table salt toprevent goitre and other disordersdue to iodine deficiency.
Potassium iodide powder


Potassium iodide is found in seaweed. Some important applications of this compound involve its use in pharmaceuticals and as a source of iodine in food,especially in animal and poultry feed. Potassium iodide is added to table salt to provide iodine in human food.
Another major use is in making photographic emulsions. In analytical chemistry, potassium iodide is used in iodometric titration with starch indicator to analyze dissolved oxygen, dissolved chlorine, sulfide, and other analytes in water.


Potassium Iodide is a source of iodine and a nutrient and dietary supplement. it exists as crystals or powder and has a solubility of 1 g in 0.7 ml of water at 25°c. it is included in table salt for the preven- tion of goiter.Potassium Iodide is used primarily used in the treatment of radiation poisoning due to environmental contamination by iodine-131. It is also manufacture of photographic emulsions; in animal and poultry feeds to the extent of 10-30 parts per million; in table salt as a source of iodine and in some drinking water; also In animal chemistry. In medicine,potassium iodide is used to regulate the thyroid gland.


Potassium iodide was first used as the primary halide in Talbot’s calotype process, then in the albumen on glass process followed by the wet collodion process. It was also used as a secondary halide in silver bromide gelatin emulsions, animal feeds, catalysts, photographic chemicals, and for sanitation. Potassium iodide is produced by reaction of potassium hydroxide with iodine. The product is purified by crystallization from water. Potassium iodide is ionic compound which iodine ions and silver ions can form yellow precipitate silver iodide (when exposes to light, it can decompose, it can be used to make high-speed photographic film), silver nitrate can be used to verify the presence of iodine ions.


Potassium iodide is made by absorption of iodine in potassium hydroxide:
I2 + 6KOH → 5KI + KIO3 + 3H2O
Most potassium iodate, KIO3 , is separated from the product mixture by crystallization and filtration. Remaining iodates are removed by evaporation of the solution and other processes, such as carbon reduction or thermal decompostion at 600oC to iodide:
2KIO3 → 2KI + 3O2
Another method of preparation that does not involve the formation of iodate is by treating iron turnings with iodine solution. The product, ferrosoferric iodide, Fe3I8?16H2O, is boiled with 15 wt% potassium carbonate solution:
Fe3I8.16H2O + 4K2CO3 → 8 KI + 4CO2 + Fe3O4 + 16H2O
A similar method is used to prepare potassium bromide, discussed earlier (see Potassium Bromide.)
Potassium iodide can be prepared by reacting hydriodic acid with potassium bicarbonate:
HI + KHCO3 → KI + CO2 + H2O
It is purified by melting in dry hydrogen.
Potassium iodide also may be obtained by various electrolytic processes.


ChEBI: Potassium iodide is a metal iodide salt with a K(+) counterion. A compound that contains pentavalent iodine, which is usually ionically bound to electropositive atoms. It is a scavenger of hydroxyl radicals. It has a role as a radical scavenger and an expectorant. It contains an iodide. It is a type of iodine that is not radioactive and can be used to help block one type of radioactive material, radioactive iodine (I-131), from being absorbed by the thyroid.

brand name

Iosat (Anbex); Thyro-Block (Medpointe); Thyrosafe (R R Registrations); Thyroshield (Fleming).

General Description

Potassium iodide is an odorless white solid. Sinks and mixes with water. (USCG, 1999)

Air & Water Reactions

Water soluble.

Reactivity Profile

Bromine trifluoride rapidly attacks the following salts: barium chloride, cadmium chloride, calcium chloride, cesium chloride, lithium chloride, silver chloride, rubidium chloride, potassium bromide, potassium chloride, Potassium iodide, rhodium tetrabromide, sodium bromide, sodium chloride, and sodium iodide [Mellor 2, Supp. 1:164, 165. 1956].

Health Hazard

May irritate eyes or open cuts.


Potassium Iodide is a metal halide composed of potassium and iodide with thyroid protecting and expectorant properties. Potassium iodide can block absorption of radioactive iodine by the thyroid gland through flooding the thyroid with non-radioactive iodine and preventing intake of radioactive molecules, thereby protecting the thyroid from cancer causing radiation. In addition, this agent acts as an expectorant by increasing secretion of respiratory fluids resulting in decreased mucus viscosity.

Clinical Use

Potassium iodide is used to treat the cutaneous lymphatic form of sporotrichosis, although newer agents are also effective in this disorder and may be better tolerated tolerated. The drug is also used for erythema nodosum and nodular vasculitis.

Safety Profile

Poison by intravenous route. Moderately toxic by ingestion and intraperitoneal routes. Human teratogenic effects by ingestion: developmental abnormalities of the endocrine system. Experimental teratogenic and reproductive effects. Mutation data reported. Explosive reaction with charcoal + ozone, trifluoroacetyl hypofluorite, fluorine perchlorate. Violent reaction or ignition on contact with dazonium salts, diisopropyl peroxydicarbonate, bromine pentafluoride, chlorine trifluoride. Incompatible with oxidants, BrF3, FClO, metaltic salts, calomel. When heated to decomposition it emits very toxic fumes of K2O and I-. See also IODIDES.

Purification Methods

Crystallise it from distilled water (0.5mL/g) by filtering the near-boiling solution and cooling. To minimise oxidation to iodine, the process can be carried out under N2 and the salt is dried under a vacuum over P2O5 at 70-100o. Before drying, the crystals can be washed with EtOH or with acetone followed by pet ether. It has also been recrystallised from water/ethanol. After 2 recrystallisations, ACS/USP grade had Li and Sb at <0.02 and <0.01 ppm respectively. [Lingane & Kolthoff Inorg Synth I 163 1939.]

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View Lastest Price from Potassium iodide manufacturers

Image Update time Product Price Min. Order Purity Supply Ability Manufacturer
Potassium iodide pictures 2024-07-16 Potassium iodide
US $10.00-1.00 / kg 1kg 99% 300tons Hebei Dangtong Import and export Co LTD
Potassium iodide pictures 2024-07-16 Potassium iodide
US $36.00-11.00 / kg 1kg 99% 300tons Hebei Dangtong Import and export Co LTD
Potassium iodide pictures 2024-07-16 Potassium iodide
US $40.00-32.00 / kg 10kg 99.99% 100Tons Hebei Dangtong Import and export Co LTD
  • Potassium iodide pictures
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  • Hebei Dangtong Import and export Co LTD
  • Potassium iodide pictures
  • Potassium iodide
  • US $36.00-11.00 / kg
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  • Potassium iodide
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Potassium iodide Spectrum

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