Product Overview

Potassium Dichromate 99.9% AR (CAS No. 7778-50-9) is the dipotassium salt of the dichromate(VI) anion and a well-characterised inorganic oxidising reagent. In acidic solution, dichromate provides reproducible stoichiometric redox chemistry through reduction of chromium(VI), while its solution speciation is linked to chromate–dichromate and protonation equilibria. These characteristics have made dichromate chemistry important in classical oxidimetric analysis and chemical-oxygen-demand procedures.

The AR grade is intended for conventional analytical reagent preparation, oxidimetric work, wet-chemical oxidation procedures and laboratory QC where potassium dichromate is specified. It may be used to prepare working oxidant solutions that are subsequently standardised according to the applicable method.

Typical Applications

• Oxidimetric titration procedures and preparation of dichromate oxidant solutions.
• Chemical oxygen demand procedures based on acidic dichromate oxidation.
• Determination of suitable reducing substances by conventional redox methods.
• Wet-chemical oxidation steps used in analytical sample treatment.
• Redox method development, verification and laboratory quality-control work.
• Spectrophotometric investigation of chromium(VI) chemistry where a certified absorbance standard is not required.

Common Synonyms

• Potassium bichromate
• Dipotassium dichromate
• Potassium dichromate(VI)
• Dichromic acid dipotassium salt
• Potassium pyrochromate

Storage Conditions

Keep tightly closed, dry and protected from contamination that could introduce reducing matter or otherwise consume chromium(VI). Maintain clean analytical handling and avoid transferring contaminated tools or residues into the original container so that oxidising capacity is preserved.