chromic

A scientist carefully handles a beaker of chromic acid in the laboratory.

Definition

1. Adjective:
   • Relating to chromium: "chromic" describes something that pertains to, contains, or is derived from the chemical element chromium, especially in its trivalent (Cr³⁺) or hexavalent (Cr⁶⁺) oxidation states.
   • Denoting a specific acid: "chromic" is most commonly used in chemistry to refer to "chromic acid" (H₂CrO₄ or H₂Cr₂O₇), a strong oxidizing agent.

Usage Examples

• Adjective:
  • The lab technician prepared a chromic acid solution for cleaning glassware. (A solution containing chromium in a high oxidation state, used for its oxidizing properties.)
  • Chromic compounds are often used in dyes and pigments. (Chemical substances that contain chromium.)

Advanced Usage

• "Chromic acid": a corrosive, dark red-orange compound used industrially for oxidation, metal finishing, and as a cleaning agent.

  • Chromic acid is highly toxic and requires careful handling in a fume hood. (The acid is dangerous and must be used with proper safety equipment.)

• "Chromic oxide": a green powder (Cr₂O₃) used as a pigment and in metallurgy.

  • Chromic oxide gives a stable green colour to ceramics and paints. (The oxide is valued for its colourfastness.)

Variants and Related Words

• Chromium (n): the metallic element (Cr) from which "chromic" is derived.

  • Stainless steel contains chromium for corrosion resistance. (The element provides durability.)

• Chromate (n): a salt or ester of chromic acid, containing the CrO₄²⁻ ion.

  • Potassium chromate is a yellow compound used in chemical analysis. (A specific chromate salt.)

• Chrome (n): short for chromium, often used in plating and alloys.

  • The car's bumpers are coated with chrome. (A shiny chromium layer.)

Synonyms

• Chromium-based: containing or derived from chromium.
• Trivalent chromium: specifically referring to the Cr³⁺ state (e.g., in chrome alum).
• Hexavalent chromium: referring to the Cr⁶⁺ state (e.g., in chromic acid).

Related Idioms

• None commonly used with "chromic" in idiomatic expressions; the term is primarily technical.

Phrasal Verbs

• None associated with "chromic"; it functions solely as an adjective in scientific contexts.