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398063

Sodium dichromate dihydrate

Name: Sodium dichromate dihydrate
Brand: SIGALD

ACS reagent, ≥99.5%

Synonym(s):

Sodium bichromate

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About This Item

Linear Formula:

Na₂Cr₂O₇ · 2H₂O

CAS Number:

7789-12-0

Molecular Weight:

298.00

NACRES:

NA.21

PubChem Substance ID:

329755905

UNSPSC Code:

12352302

EC Number:

234-190-3

MDL number:

MFCD00149166

Assay:

≥99.5%

Grade:

ACS reagent

Form:

crystals

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Properties

grade

ACS reagent

Quality Segment

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 (SO₄^2-): ≤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

Description

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.

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pictograms

GHS03,GHS06,GHS08,GHS05,GHS09

signalword

Danger

hcodes

H272,H301,H312,H314,H317,H330,H334,H340,H350,H360FD,H372,H410

pcodes

P210 - P260 - P280 - P303 + P361 + P353 - P304 + P340 + P310 - P305 + P351 + P338

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

Storage Class

5.1B - Oxidizing hazardous materials

wgk

WGK 3

flash_point_f

Not applicable

flash_point_c