Is Methanol (CH₃OH) a Strong or Weak Acid?
Is Methanol (CH₃OH) a strong or weak acid?
Methanol is a very weak acid, similar in strength to water. Alcohols can lose their O-H proton to strong bases like NaH or NaNH2, but they do not dissociate appreciably on their own.
| Formula | CH₃OH |
| Name | Methanol |
| Category | Weak acid |
| pKa | 15.5 |
| Conjugate | Methoxide ion (CH₃O⁻) |
| Key Concept | Alcohol as very weak acid |
Definition
Methanol is an extremely weak Bronsted-Lowry acid. Its O-H proton can be donated to very strong bases, but it barely dissociates in water.
Acidic Proton / Active Site
The O-H hydrogen is the acidic proton. The C-H hydrogens on the methyl group are not acidic (pKa ~50).
Conjugate Pair
CH3OH -> CH3O- + H+. The methoxide ion (CH3O-) is a strong base because it is the conjugate base of a very weak acid.
Strength Classification
pKa = 15.5, nearly identical to water (15.7). Methanol is about as acidic as water. It only donates a proton to very strong bases like sodium hydride (NaH).
See acidic protons, conjugate base overlays, and pKa labels on interactive 3D molecules.
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