AmineshardNUMERICAL

How many specific intermolecular hydrogen bonds can the conjugate acid of a simple primary aliphaticAmines Chemistry Question

Question

How many specific intermolecular hydrogen bonds can the conjugate acid of a simple primary aliphatic amine ($RNH_3^+$) potentially donate to surrounding water molecules in an aqueous medium?

Answer: 3

💡 Solution & Explanation

The basicity of amines in aqueous solution depends fundamentally on the stabilization of their conjugate acids via solvation (hydration energy). A primary amine ($RNH_2$) accepts a proton to form an alkylammonium cation ($RNH_3^+$). This cation uniquely possesses three $N-H$ bonds, allowing it to act as a hydrogen bond donor to three distinct water molecules, providing maximum hydration stabilization.

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