Definition

1. Noun:
   • A colorless crystalline organic acid: Phthalic acid is a specific chemical compound, an aromatic dicarboxylic acid, with the formula C₆H₄(COOH)₂. It is primarily used as a starting material or intermediate in industrial chemical synthesis.

Usage

• Phthalic acid is used industrially. It is not typically used in everyday conversation but in scientific, industrial, and manufacturing contexts.
• It commonly appears in discussions about the production of other chemicals.

Examples

• Noun:
  • The laboratory synthesized the dye from phthalic acid.
  • Phthalic acid is a key precursor in the manufacture of phthalate plasticizers.
  • The chemical properties of phthalic acid make it suitable for creating certain polymers.

Advanced Usage

• "Phthalic acid derivatives": Refers to compounds chemically derived from phthalic acid, such as its esters (phthalates).
  • The safety of various phthalic acid derivatives is under review.

Variants and Related Words

• Phthalate (noun): An ester or salt of phthalic acid, widely used as plasticizers.
  • Some phthalates are used to make plastics more flexible.
• Phthalic anhydride (noun): The anhydride form of phthalic acid, a major industrial chemical.
  • Phthalic anhydride is produced by the oxidation of ortho-xylene.

Synonyms

• Benzene-1,2-dicarboxylic acid: The systematic IUPAC name for phthalic acid.
• ortho-Phthalic acid: A name specifying the relative position of the carboxyl groups on the benzene ring.

Notes

• Phthalic acid itself is not commonly an end-product in consumer goods but is an important industrial intermediate. Its name is most frequently encountered in compound forms like "phthalates" or in the names of production processes.

Noun

1. a colorless acid used to make dyes and perfumes