4-Hydroxybenzoic acid4-Hydroxybenzoic acid, also known as p-hydroxybenzoic acid (PHBA), is a monohydroxybenzoic acid, a phenolic derivative of benzoic acid. It is a white crystalline solid that is slightly soluble in water and chloroform but more soluble in polar organic solvents such as alcohols and acetone. Read from the Chembox of the Wikipedia article 4-Hydroxybenzoic acid, revision 1380140161.

Property

Value

Formula

C7H6O3, 138.12 g/mol

Melting point

214.5 °C

Density

1.46 g/cm³

log P, measured

1.58

pKa

4.54

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