SODIUM BICHROMATE

PRODUCT IDENTIFICATION

TOXICITY

SMILES

CLASSIFICATION

EXTRA NOTES

PHYSICAL AND CHEMICAL PROPERTIES

400 C

Highly soluble (74.0% at 25°C)

3.0 - 4.6 upon concentration

REFRACTIVE INDEX

NFPA RATINGS

AUTOIGNITION

400 C

EXTERNAL LINKS & GENERAL DESCRIPTION

Wikipedia Linking

Google Scholar Search

Drug Information Portal (U.S. National Library of Medicine) - Sodium dichromate

PubChem Compound Summary - Sodium dichromate

IPCS INCHEM -  Chromium

KEGG (Kyoto Encyclopedia of Genes and Genomes) -  Chromate

http://www.ebi.ac.uk/ -  Dichromate

http://www.ncbi.nlm.nih.gov/ -  Sodium dichromate

Material Safety Data Sheet

Local:
Chromium (symbol Cr and atomic number 24) occurs in the oxidation states 0, +2, +3, and +6 states. Element (0) and divalent chromium, however, are unstable. Chromium (0) immediately produce a thin oxide layer. Divalent chromium is easily oxidized to the trivalent form in air. The trivalent and hexavalent oxidation states are important in industry, which exit in their divalent anions called chromate and dichromate respectively and an chromic anhydride form called chromium trioxide (CrO₃) and chromic oxide (Cr₂O₃₎. In industrial, chromium trioxide is called chromic acid. The principal uses of chromium are in the metallurgical processing of ferrochromium and other metallurgical products to impart corrosion resistance, chiefly stainless steel. There are applications in chrome plating, anodizing aluminium, and refractory processing of chrome brick. When combined with oxygen together other metallic elements such as lead and potassium, it forms various inorganic pigments. Chromium is used in chemical processing to produce chromic acid and chromates. Chromates are strong oxidants which will produce many organic and inorganic materials and used in the purification of chemicals. Chromates are used as rust and corrosion inhibitors in diesel engines. Dichromate is converted to chromic sulfate for tanning of leather. Chromates and dichromates are used as pigments in paints and in dyeing. Chrome colors include black, red, orange, green, and yellow. Chromate salts contain the chromate ion, CrO₄^-2, and have an intense yellow color. Dichromate salts contain the dichromate ion, Cr₂O₇^-2, and have an intense orange color. Chromates are used as mordant in dyeing cloth.

Potassium dichromate, also called red potassium chromate, is a bright yellowish-red crystals melting point at 396 C, decomposes at 500 C. Sodium dichromate is a red to orange deliquescent crystals melts at 320C. Sodium dichromate undergoes hydration when heated at 105C. They are soluble in water, insoluble in alcohol. Sodium and potassium dichromates are widely used as sources of other chromium compounds including chromic acid. Dichromates are power oxidizing agents which find applications in:

• Chromium source in preparing chromium compounds
• Leather tanning and screen printing
• Electroplating
• Pyrotechnics and explosives
• Pigment preparation
• Wood Preservative
• Metal Treating and corrosion inhibitor
• Oil drilling
• Catalyst for the chromium metal production
• Photographic engraving

In biological field, potassium dichromate is used as a fixative for used for conservation of tissue sections. 

APPEARANCE

0.2% max

HAZARD OVERVIEW

GHS

Danger

PICTOGRAMS

HAZARD STATEMENTS

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

P STATEMENTS

P201-P220-P260-P273-P280-P284

RISK PHRASES

45-46-60-61-8-21-25-26-34-42/43-48/23-50/53

SAFETY PHRASES

53-45-60-61