Phthalic Acid

C₈H₆O₄

IUPAC: Benzene-1,2-dicarboxylic acid

CAS: 88-99-3

Overview

Phthalic acid is an aromatic dicarboxylic acid primarily used to make phthalate plasticizers and polyester resins. Its anhydride is a major industrial chemical.

Composition

Element Symbol Atoms Atomic Mass
Hydrogen H 6 1.0080
Carbon C 8 12.0110
Oxygen O 4 15.9990

Elemental Composition

H
Hydrogen ×6
3.6%
C
Carbon ×8
57.8%
O
Oxygen ×4
38.5%

Uses

  • • Plasticizer production
  • • Polyester resin
  • • Dye manufacture

Fun Facts

  • ✦ Phthalic anhydride production exceeds 5 million tonnes per year globally

Safety

  • ⚠ Irritant

Structure

SMILES

C1=CC=C(C(=C1)C(=O)O)C(=O)O

Properties

Type
organic
State
solid
Molar Mass
166.13 g/mol
Density
1.5930 g/cm³
Melting Point
207.0 °C
Solubility
6.3 g/L at 25°C

Molecular Descriptors

Exact Mass
166.0266
XLogP
0.7
TPSA
74.6 Ų
H-Bond Donors
2
H-Bond Acceptors
4
Rotatable Bonds
2
Heavy Atoms
12
Complexity
177.0

Related Compounds

1,2-Dichloroethane

C₂H₄Cl₂

1,3-Butadiene

C₄H₆

1,4-Dioxane

C₄H₈O₂

1-Butanol

C₄H₁₀O

2-Propanol

C₃H₈O

Acetaldehyde

CH₃CHO

Acetamide

C₂H₅NO

Acetic Anhydride

C₄H₆O₃

Acetone

(CH₃)₂CO

Acetonitrile

C₂H₃N

Frequently Asked Questions

What is Phthalic Acid?
Phthalic Acid (C₈H₆O₄) is a organic compound with the IUPAC name Benzene-1,2-dicarboxylic acid.
What is the molecular weight of Phthalic Acid?
Phthalic Acid has a molar mass of 166.13 g/mol.
What state is Phthalic Acid at room temperature?
Phthalic Acid is a solid at room temperature.
Is Phthalic Acid organic or inorganic?
Phthalic Acid is classified as an organic compound.
What elements make up Phthalic Acid?
Phthalic Acid (C₈H₆O₄) is composed of Hydrogen (H), Carbon (C), Oxygen (O).