What is the ionization constant of formic acid (HCOOH)?
\(1.8 \times 10^{-4}\)
Formic acid (methanoic acid) is a weak carboxylic acid that ionizes only partially in water: HCOOH ⇌ HCOO⁻ + H⁺.
Its acid dissociation constant is \(K_a = \frac{[HCOO^-][H^+]}{[HCOOH]}\), which has a value of about \(1.8 \times 10^{-4}\) at 25 °C (pKa ≈ 3.75).
This makes formic acid roughly ten times stronger than acetic acid, whose \(K_a\) is about \(1.8 \times 10^{-5}\).
Hence, \(1.8 \times 10^{-4}\).
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