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Merck

30315-M

Potassium iodide

puriss. p.a., reag. ISO, reag. Ph. Eur., ≥99.0%

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About This Item

Linear Formula:
KI
CAS Number:
7681-11-0
Molecular Weight:
166.00
NACRES:
NA.21
PubChem Substance ID:
329753460
UNSPSC Code:
12352302
EC Number:
231-659-4
MDL number:
MFCD00011405
Assay:
≥99.0%, 99.0-100.5% (calc. to the dried substance)
Form:
crystalline
Solubility:
water: complete (ca.1,430 g/l at 25 °C (77 °F))

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InChI

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

InChI key

NLKNQRATVPKPDG-UHFFFAOYSA-M

agency

reag. ISO, reag. Ph. Eur.

vapor pressure

1 mmHg ( 745 °C)

grade

puriss. p.a.

assay

≥99.0%, 99.0-100.5% (calc. to the dried substance)

form

crystalline

impurities

Reducing substances, complies, ≤0.0005% heavy metals (as Pb), ≤0.005% thiosulfate (S2O3), ≤0.02% free alkali (as KOH), ≤10 ppm total nitrogen (N)

loss

≤0.2% loss on drying, 105 °C

pH

6-8 (20 °C, 5%)

mp

681 °C (lit.)

Quality Level

100

solubility

water: complete (ca.1,430 g/l at 25 °C (77 °F))

anion traces

bromide, chloride (as Cl-): ≤100 ppm, iodate (IO3-): ≤2 ppm, phosphate (PO43-): ≤10 ppm, sulfate (SO42-): ≤10 ppm

cation traces

As: ≤0.00001%, Ba: ≤0.002%, Ca: ≤0.001%, Fe: ≤0.0003%, Mg: ≤0.001%, Na: ≤0.03%

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General description

Potassium iodide (KI) is an inorganic potassium salt. It is used as an iodide ion source for nucleophilic displacement reactions and acts as a mediator during the electrochemical oxidations of aldehydes. In presence of an acid, KI cleaves some ethers. KI reacts with sulfonyl chlorides to produce symmetrical thiosulfonic S-esters. In the presence of oxidizing agents, KI iodinates aromatic compounds and organothallium compounds.

Application

Potassium iodide is used:
  • As a solid base catalyst loaded with alumina for transesterification of soybean oil with methanol.
  • As a iodide source in the solvothermal synthesis of BiOI (bismuth oxyiodide) microspheres using ethylene glycol solvent.
  • In the synthesis of RGO (reduced graphene oxide) from GO (graphite oxide) in presence of HCl–KI mixture.

signalword

Danger

target_organs

Thyroid

Storage Class

6.1C - Combustible acute toxic Cat.3 / toxic compounds or compounds which causing chronic effects

flash_point_f

Not applicable

flash_point_c

Not applicable

pictograms

Health hazardExclamation mark
GHS08,GHS07

Hazard Classifications

Eye Irrit. 2 - Repr. 1B - STOT RE 2

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