Potassium iodide
SIGALD/30315 - puriss. p.a., reag. ISO, reag. Ph. Eur., ≥99.0%
CAS Number: 7681-11-0
Empirical Formula (Hill Notation): KI
Molecular Weight: 166.00
EC Number: 231-659-4
MDL Number: MFCD00011405
Linear Formula: KI
Product Type: Chemical
agency | reag. ISO |
reag. Ph. Eur. | |
USP/NF | |
anion traces | bromide, chloride (as Cl-): ≤100 mg/kg |
iodate (IO3-): ≤2 mg/kg | |
phosphate (PO43-): ≤10 mg/kg | |
sulfate (SO42-): ≤10 mg/kg | |
assay | ≥99.0% |
99.0-100.5% (calc. to the dried substance) | |
cation traces | As: ≤0.1 mg/kg |
Ba: ≤20 mg/kg | |
Ca: ≤10 mg/kg | |
Fe: ≤3 mg/kg | |
Mg: ≤10 mg/kg | |
Na: ≤300 mg/kg | |
description | REDUCING SUBSTANCES complying |
form | solid |
grade | puriss. p.a. |
impurities | ≤0.0005% heavy metals (as Pb) |
≤0.001% total nitrogen (N) | |
≤0.005% thiosulfate (S2O3) | |
≤0.02% free alkali (as KOH) | |
InChI | 1S/HI.K/h1H;/q;+1/p-1 |
InChI key | NLKNQRATVPKPDG-UHFFFAOYSA |
loss | ≤0.5% loss on drying, 105 °C |
mp | 681 °C (lit.) |
pH | 6.0-8.0 (20 °C, 5%) |
Quality Level | 200 ![]() |
SMILES string | [K+].[I-] |
vapor pressure | 1 mmHg ( 745 °C) |
Application: | Potassium iodide is used as: • An iodine source in the synthesis of 1-iodoalkynes and iodophenols from alkynes and phenols using tert-butyl hydroperoxide (TBHP) as oxidant. • A catalyst in the synthesis of sulfonated oxindoles by arylsulfonylation of activated alkenes using sulfonylhydrazides as sulfonyl precursor, and water as solvent. • An oxidative degradation inhibitor to reduces oxidative degradation of monoethanolamine (MEA). |
General description: | Potassium iodide (KI) is a chemical compound that can be used as an iodide ion source for nucleophilic displacement reactions. During the electrochemical oxidation of aldehydes, it acts as a mediator. In the presence of an acid, it can cleave some ethers. KI can iodinate aromatic and organothallium compounds in the presence of an oxidizing agent. Additionally, it can form symmetrical thiosulfonic S-esters by reacting with sulfonyl chlorides. |
Symbol | ![]() |
Signal word | Danger |
Hazard statements | H372 |
Precautionary statements | P260 - P264 - P270 - P314 - P501 |
Hazard Codes | Xn |
Risk Statements | 22-36/38 |
Safety Statements | 26 |
RIDADR | NONH for all modes of transport |
WGK Germany | WGK 3 |
Purity | ≥99.0%; 99.0-100.5% (calc. to the dried substance) |
mp | 681 °C (lit.) |
UNSPSC | 12352300 |