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Merck
모든 사진(3)

문서

207802

Sigma-Aldrich

Potassium dichromate

ACS reagent, ≥99.0%

동의어(들):

Potassium bichromate

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모든 사진(3)

About This Item

Linear Formula:
K2Cr2O7
CAS Number:
7778-50-9
Molecular Weight:
294.18
EC Number:
231-906-6
MDL number:
MFCD00011367
UNSPSC 코드:
12352302
PubChem Substance ID:
329752023
NACRES:
NB.24

Grade

ACS reagent

Quality Level

200

분석

≥99.0%

형태

crystals

반응 적합성

reagent type: oxidant

불순물

≤0.005% insolubles

손실

≤0.05% loss on drying

pH

3.5-5.0 (25 °C, 29.4 g/L)

mp

398 °C (lit.)

음이온 미량물

chloride (Cl-): ≤0.001%
sulfate (SO42-): ≤0.005%

양이온 미량물

Ca: ≤0.003%
Na: ≤0.001%
Na: ≤0.02%
heavy metals (as Pb): ≤5 ppm

SMILES string

[K+].[K+].[O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O

InChI

1S/2Cr.2K.7O/q;;2*+1;;;;;;2*-1

InChI key

KMUONIBRACKNSN-UHFFFAOYSA-N

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일반 설명

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.

애플리케이션

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.

신호어

Danger

Hazard Classifications

Acute Tox. 2 Inhalation - Acute Tox. 3 Oral - Acute Tox. 4 Dermal - Aquatic Acute 1 - Aquatic Chronic 1 - Carc. 1B - Eye Dam. 1 - Muta. 1B - Ox. Sol. 2 - Repr. 1B - Resp. Sens. 1 - Skin Corr. 1B - Skin Sens. 1 - STOT RE 1 Inhalation - STOT SE 3

표적 기관

Cardio-vascular system, Respiratory system

Storage Class Code

5.1B - Oxidizing hazardous materials

WGK

WGK 3

Flash Point (°F)

Not applicable

Flash Point (°C)

Not applicable

시험 성적서(COA)

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Sodium dichromate dihydrate ACS reagent, ≥99.5%

Sigma-Aldrich

398063

Sodium dichromate dihydrate

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