) well, making ammonia a weak base in water; in non-polar solvents like hexane, the lack of such stabilization can make ammonia act as a stronger base.

Report: Solvent Effects on Acid-Base Strength 1. Introduction

The strength of an acid or base is not an intrinsic property of the solute alone but is profoundly influenced by the medium in which it is dissolved. While water is the most common solvent, its high dielectric constant and ability to form hydrogen bonds often mask the varying strengths of different chemical species. In non-aqueous solvents, the relative and absolute strengths of acids and bases can shift by many orders of magnitude, a phenomenon critical for synthetic chemistry, pharmaceuticals, and industrial manufacturing. 2. Theoretical Principles of Solvent Interaction