Question

You have a buffer composed of NH3 and NH4Cl. Write the reaction that will occur when some strong acid, H+, is added to the solution. Write the reaction that Will occur when some strong base, OH- is added to the solution.

Answer 1

NH₃(aq) + H⁺(aq) --------> NH₄⁺(aq)

NH₄⁺(aq) + OH^-(aq) --------> NH₃(aq) + H₂O(l)

Explanation

A buffer is a combination of weak acid and its salt with strong base or weak base and its salt with strong acid

NH3 is weak base and NH4Cl is the salt of the reaction between NH3 and strong acid HCl

NH4⁺ is conjucate acid of weak base NH3

when H⁺ ions are added it reacts with NH3

NH3(aq) + H⁺(aq) --------> NH4⁺(aq)

when OH^- ions are added it reacts with

NH4⁺(aq) + OH^{​​​​​​-}(aq) -------> NH3(aq) + H2O(l)