Is NH4+ a strong acid?

NO, NH4⁺ (ammonium ion) is not a strong acid. NH4⁺ is the conjugate acid of the weak base ammonia (NH3). It is a weak acid. This is because they are in equilibrium in solution. It partially supplies protons (H⁺) in aqueous solution, resulting in a low concentration of H⁺ ions and a higher pH than strong acids. This means that there is always some NH3 and NH4⁺ present in the equilibrium between NH3 and NH4⁺.

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