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The conjugate acid of ch3nh2 is ch3nh3+.
For example methylamine in water chemical reaction: 
CH₃NH₂(aq)+ H₂O(l) ⇌ CH₃NH₃⁺(aq) + OH⁻(aq).
According to  Bronsted-Lowry theory acid are donor of protons and bases are acceptors of protons (the hydrogen cation or H⁺). Methylamine (CH₃NH₂) is Bronsted base and it can accept proton and become conjugate acid (CH₃NH₃⁺).
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The conjugate acid of CH3NH2 is CH3NH3+

Conjugate acids and bases

According to Brønsted–Lowry definition of acids and bases, a conjugate acid–base pair is a pair of two substances that differ only by the presence of a proton (H⁺).

  • A conjugate acid is formed when a proton is added to a base, and
  • A conjugate base is formed when a proton is removed from an acid.

From the definition given above, CH3NH2 is a base.

The conjugate acid will differ from the CH3NH2 by a H+ ion.

Therefore, the conjugate acid of CH3NH2 is CH3NH3+

Learn more about conjugate acid and base at: https://brainly.com/question/22514615

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