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398063

Sigma-Aldrich

Sodium dichromate dihydrate

ACS reagent, ≥99.5%

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Synonym(s):
Sodium bichromate
Linear Formula:
Na2Cr2O7 · 2H2O
CAS Number:
7789-12-0
Molecular Weight:
298.00
EC Number:
234-190-3
MDL number:
MFCD00149166
PubChem Substance ID:
329755905

grade

ACS reagent

Quality Level

200

Assay

≥99.5%

form

crystals

reaction suitability

reagent type: oxidant

impurities

≤0.005% NH4OH ppt.
≤0.005% insolubles

pH

3.5 (20 °C, 100 g/L)

mp

91 °C (lit.)

anion traces

chloride (Cl-): ≤0.005%
sulfate (SO42-): ≤0.01%

cation traces

Al: ≤0.002%
Ca: ≤0.003%

SMILES string

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

InChI

1S/2Cr.2Na.2H2O.7O/h;;;;2*1H2;;;;;;;/q;;2*+1;;;;;;;;2*-1

InChI key

JYDRNIYTFCBIFC-UHFFFAOYSA-N

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This Item
402826P2588207802
Sodium dichromate dihydrate ACS reagent, ≥99.5%

Sigma-Aldrich

398063

Sodium dichromate dihydrate

Ammonium dichromate ACS reagent, ≥99.5%

Sigma-Aldrich

402826

Ammonium dichromate

Potassium dichromate BioXtra, ≥99.5%

Sigma-Aldrich

P2588

Potassium dichromate

Potassium dichromate ACS reagent, ≥99.0%

Sigma-Aldrich

207802

Potassium dichromate

assay

≥99.5%

assay

≥99.5%

assay

≥99.5%

assay

≥99.0%

form

crystals

form

crystals

form

powder or crystals

form

crystals

impurities

≤0.005% NH4OH ppt., ≤0.005% insolubles

impurities

≤0.005% insolubles

impurities

<0.005% Phosphorus (P), <0.1% Insoluble matter

impurities

≤0.005% insolubles

pH

3.5 (20 °C, 100 g/L)

pH

3-4 (25 °C, 50 g/L)

pH

3.6 (100 g/L)

pH

3.5-5.0 (25 °C, 29.4 g/L)

mp

91 °C (lit.)

mp

170 °C (dec.) (lit.)

mp

398 °C (lit.)

mp

398 °C (lit.)

General description

Sodium dichromate dehydrate (SDD), a hexavalent chromium compound is commonly used as an oxidizing agent. Chromium (VI) compounds are genotoxic and group 1 IARC (International Agency for Research on Cancer) carcinogen. SDD is one of the common contaminants found in drinking water. Its toxic effects and carcinogenicity has been studied.

Application

Sodium dichromate dehydrate may be used in preparing Jones reagent which is employed for oxidation reactions. It may be used in the oxidation of arylalkanes.

Signal Word

Danger

Hazard Classifications

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

Storage Class Code

5.1B - Oxidizing hazardous materials

WGK

WGK 3

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

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