We're being asked to write an equation showing how a buffer neutralizes an added acid (HCl). The buffer is made up of ammonia and ammonium chloride.
• Ammonia is a neutral amine and has a formula of NH3
In a solution, ammonia will ionize to produce its conjugate acid. Recall from Bronsted-Lowry definition, bases are proton (H+) acceptors and acids are proton (H+) donors
NH3 will accept H+ from H2O
NH3 + H2O → NH4+ + OH-
(weak base) (conjugate acid)
• ammonium chloride has a formula of NH4Cl. It contains the conjugate acid. It is an ion and will break up in the solution:
A buffer contains significant amounts of ammonia and ammonium chloride.
Write an equation showing how this buffer neutralizes added acid (HCl).
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