dichromate

/dai'koumit/

Thân thiện

A chemist carefully adds potassium dichromate to a beaker of clear liquid.

Definition

1. Noun:
   • A chemical compound: A dichromate is a salt containing the anion Cr₂O₇²⁻, derived from dichromic acid. It is characterized by its bright orange or red color and strong oxidizing properties.

Usage

• As a noun (countable/uncountable): The term "dichromate" is used to refer to the chemical ion or specific salts containing it. It is commonly used in chemistry, industrial processes, and historical photographic techniques.
  • Potassium dichromate is often used in laboratory experiments as an oxidizing agent.
  • The old photographic process relied on the light-sensitive properties of ammonium dichromate.

Advanced Usage

• In specific compounds: The name is typically preceded by the cation to specify the exact salt.
  • Sodium dichromate is a common industrial chemical.
• In environmental and safety contexts: Dichromates are often discussed regarding their toxicity and environmental impact.
  • Proper disposal of dichromate waste is essential due to its hexavalent chromium content.

Variants and Related Words

• Dichromic acid (n): The hypothetical acid (H₂Cr₂O₇) from which dichromates are derived.
• Chromate (n): A related salt containing the CrO₄²⁻ anion, often interconvertible with dichromate under different pH conditions.
• Bichromate (n): An older, synonymous term for dichromate, now less common in technical use.

Synonyms

• Bichromate: An exact synonym, though "dichromate" is the preferred IUPAC name.

Related Phrases / Idioms

(Not commonly used in idiomatic expressions due to its technical nature.)

Học thuật

Noun

1. a salt of the hypothetical dichromic acid

Từ đồng nghĩa

• bichromate