Potassium dichromate
SIGALD/207802 - ACS reagent, ≥99.0%
Synonym: Potassium bichromate
CAS Number: 7778-50-9
Empirical Formula (Hill Notation): Cr2K2O7
Molecular Weight: 294.18
EC Number: 231-906-6
MDL Number: MFCD00011367
Linear Formula: K2Cr2O7
Product Type: Chemical
anion traces | chloride (Cl-): ≤0.001% |
sulfate (SO42-): ≤0.005% | |
assay | ≥99.0% |
cation traces | Ca: ≤0.003% |
heavy metals (as Pb): ≤5 ppm | |
Na: ≤0.001% | |
Na: ≤0.02% | |
form | crystals |
grade | ACS reagent |
impurities | ≤0.005% insolubles |
InChI | 1S/2Cr.2K.7O/q;;2*+1;;;;; |
InChI key | KMUONIBRACKNSN-UHFFFAOYSA |
loss | ≤0.05% loss on drying |
mp | 398 °C (lit.) |
pH | 3.5-5.0 (25 °C, 29.4 g/L) |
Quality Level | 200 ![]() |
reaction suitability | reagent type: oxidant |
SMILES string | [K+].[K+].[O-][Cr](=O)(=O |
Application: | Potassium dichromate may be used in the preparation of hybride polymer-clay nanocomposite supported dichromate reagents. It may also be used as an oxidant for the selective oxidation of primary and secondary alcohol to corresponding aldehydes and ketones, respectively. |
General description: | Potassium dichromate is a red-orange colored solid. Its crystals belong to the triclinic crystal system. On heating above 600°C, it decomposes to give oxygen, potassium chromate and chromium(III) oxide. It acts as a strong oxidizing agent in acidic media. It can be synthesized by the fusion of chromium(III) oxide with potassium carbonate and nitrate or oxygen. |
Packaging: | 100, 500 g in poly bottle |
Symbol | ![]() ![]() ![]() ![]() ![]() |
Signal word | Danger |
Hazard statements | H272 - H301 - H312 - H314 - H317 - H330 - H334 - H335 - H340 - H350 - H360FD - H372 - H410 |
Precautionary statements | P210 - P260 - P280 - P303 + P361 + P353 - P304 + P340 + P310 - P305 + P351 + P338 |
Hazard Codes | O,T+,N |
Risk Statements | 45-46-60-61-8-25-26-27-34-42/43-48/23-50/53 |
Safety Statements | 53-26-36/37-45-60-61 |
RIDADR | UN3086 - class 6.1 - PG 2 - EHS - RQ -Toxic solids, oxidizing, n |
WGK Germany | WGK 3 |
Flash Point(F) | Not applicable |
Flash Point(C) | Not applicable |
Purity | ≥99.0% |
mp | 398 °C (lit.) |
UNSPSC | 12352300 |