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4-Aminobenzoic acid

IUPAC: 4-aminobenzoic acid

C7H7NO2 Acids CAS 150-13-0
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Quick Reference
Formula / NotationC7H7NO2
CAS Number150-13-0
Molecular Weight137.14
Melting Point370 to 372 °F (NTP, 1992)
Density1.37 (NTP, 1992) - Denser than water; will sink
Solubility6110 mg/L (at 30 °C)
AppearanceP-aminobenzoic acid appears as colorless crystals that discolor on exposure to light and air. (NTP, 1992)
Also Known As150-13-0; p-aminobenzoic acid; PABA; Vitamin BX; para-aminobenzoic acid; p-Carboxyaniline; Sunbrella; 4-Carboxyaniline; Paraminol; Pabacyd
CategoryAcids

What is 4-Aminobenzoic acid?

4-aminobenzoic acid is an aminobenzoic acid in which the amino group is para to the carboxy group. It has a role as an allergen, a plant metabolite and an Escherichia coli metabolite. It is functionally related to a benzoic acid. It is a conjugate base of a 4-carboxyanilinium. It is a conjugate acid of a 4-aminobenzoate. It is a tautomer of a 4-ammoniobenzoate.

Formula & Notation

C7H7NO2

IUPAC Name: 4-aminobenzoic acid

Other Names / Synonyms: 150-13-0; p-aminobenzoic acid; PABA; Vitamin BX; para-aminobenzoic acid; p-Carboxyaniline; Sunbrella; 4-Carboxyaniline; Paraminol; Pabacyd

Properties & Characteristics

Appearance: P-aminobenzoic acid appears as colorless crystals that discolor on exposure to light and air. (NTP, 1992). Molecular formula: C7H7NO2. Molecular weight: 137.14 g/mol. Melting point: 370 to 372 °F (NTP, 1992). Density: 1.37 (NTP, 1992) - Denser than water; will sink. Solubility: 6110 mg/L (at 30 °C). Vapor pressure: 0.000278 [mmHg]. LogP: 0.8.

Physical Data

PropertyValue
Melting Point370 to 372 °F (NTP, 1992)
Density1.37 (NTP, 1992) - Denser than water; will sink
Molecular Weight137.14
Solubility6110 mg/L (at 30 °C)
AppearanceP-aminobenzoic acid appears as colorless crystals that discolor on exposure to light and air. (NTP, 1992)

Uses & Applications

Used in industrial chemical synthesis, fertilizer production, battery electrolytes, metal processing, and laboratory acid-base reactions.

Safety Information

Corrosive. Causes severe burns to skin, eyes, and respiratory tract. Wear appropriate PPE including gloves, goggles, and lab coat. Consult SDS before use.

Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.

Key Facts

Term 4-Aminobenzoic acid
Formula C7H7NO2
CAS Number 150-13-0
Molecular Weight 137.14
Category Acids
Index All "A" terms
Synonyms 150-13-0; p-aminobenzoic acid; PABA; Vitamin BX; para-aminobenzoic acid; p-Carboxyaniline; Sunbrella; 4-Carboxyaniline; Paraminol; Pabacyd

Frequently Asked Questions

4-aminobenzoic acid is an aminobenzoic acid in which the amino group is para to the carboxy group. It has a role as an allergen, a plant metabolite and an Escherichia coli metabolite. It is functionally related to a benzoic acid. It is a conjugate base of a 4-carboxyanilinium. It is a conjugate acid of a 4-aminobenzoate. It is a tautomer of a 4-ammoniobenzoate.

More "A" Terms

Absolute Entropy of a Substance S° Absolute Zero 0 K = −273.15°C Absorption Spectrum E = hν; A = εlc Accuracy Acenaphthene C12H10 Acetaldehyde C2H4O Acetic Acid CH₃COOH (C₂H₄O₂) Acetic anhydride C4H6O3 Acetone C3H6O Acetonitrile C2H3N Acetophenone C8H8O Acetyl chloride C2H3ClO
View all "A" terms →
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Editorial standards: Chemical data is sourced from peer-reviewed literature, CAS Registry, NIST WebBook, and PubChem. Safety information reflects guidance from OSHA, ECHA, and IAEA. For educational purposes only — always consult official SDS documentation and qualified professionals before handling chemicals.

AllChemicals.info — The Online Chemical Glossary | https://allchemicals.info/chemical/4-aminobenzoic-acid

For educational purposes only. Verify all information before use.