potassium dichromate

Definition

Noun:
- A chemical compound: Potassium dichromate is an inorganic compound with the formula K₂Cr₂O₇. It is a crystalline ionic solid with a bright orange-red color.
- An oxidizing agent: It is a powerful and commonly used oxidizing agent in various chemical reactions and industrial processes.
- A source of chromium(VI): It contains chromium in its +6 oxidation state, which gives it its characteristic color and reactive properties.

Usage Examples

Noun:
- The laboratory uses potassium dichromate for cleaning glassware.
- In the past, potassium dichromate was a key ingredient in certain photographic processes.
- The bright orange color of the solution is due to dissolved potassium dichromate.

Advanced Usage

In analytical chemistry: Potassium dichromate is used as a primary standard in titrations for determining the concentration of reducing agents, such as in the measurement of Chemical Oxygen Demand (COD) in water samples.
- The COD test involves oxidizing organic matter with potassium dichromate under acidic conditions.
In safety contexts: Due to its toxicity and status as a carcinogen and strong oxidizer, its handling requires strict safety protocols.
- All containers of potassium dichromate must be clearly labeled with hazard warnings.

Variants and Related Words

Potassium chromate (n): A related yellow compound with the formula K₂CrO₄, containing chromium(VI).
Sodium dichromate (n): A similar orange-red compound, Na₂Cr₂O₇, often used for analogous purposes.
Chromium trioxide (n): Another potent chromium(VI) compound, CrO₃, used as an oxidizing agent.

Synonyms

Related Phrases and Terms

Oxidizing agent: A substance that can accept electrons from another substance, a key property of potassium dichromate.
Hexavalent chromium: Refers to chromium in the +6 oxidation state, which is present in this compound and is a known health hazard.
Primary standard: A highly pure compound used for precise quantitative analysis, a role potassium dichromate can serve.

Noun