Is Methylamine (CH₃NH₂) a Strong or Weak Base?
Is Methylamine (CH₃NH₂) a strong or weak base?
Methylamine is a slightly stronger base than ammonia. The methyl group is electron-donating, which increases electron density on nitrogen, making the lone pair more available for proton acceptance.
| Formula | CH₃NH₂ |
| Name | Methylamine |
| Category | Weak base |
| pKa | 10.66 |
| Conjugate | Methylammonium ion (CH₃NH₃⁺) |
| Key Concept | Organic base, compare with ammonia |
Definition
Methylamine is a weak Bronsted-Lowry base. Its nitrogen lone pair accepts protons from water. The methyl group makes it a slightly stronger base than ammonia.
Acidic Proton / Active Site
Methylamine primarily acts as a base, not an acid. The lone pair on nitrogen is the key - it accepts H+ to form CH3NH3+.
Conjugate Pair
CH3NH2 + H+ -> CH3NH3+ (methylammonium, conjugate acid). The pKb of methylamine is lower than ammonia, meaning it accepts protons more readily.
Strength Classification
Kb = 4.4 x 10^-4, making it a weak base but stronger than ammonia (Kb = 1.8 x 10^-5). The electron-donating methyl group increases basicity.
See acidic protons, conjugate base overlays, and pKa labels on interactive 3D molecules.
Explore Methylamine's Acid-Base Properties in 3DRelated Topics
Is Ammonia Strong or Weak?
Acid-base classification of NH₃
Is Hydrazine Strong or Weak?
Acid-base classification of N₂H₄
Is Hydrochloric Acid Strong or Weak?
Compare with strong acid
Is Acetic Acid Strong or Weak?
Compare with weak acid
Acidity Ranking
Compare acid strength between molecule pairs
Ionic vs Covalent Bonding
Understand how electronegativity affects bond character