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MDCAT Chemistry QUESTION #4371
Question 1
What happens when $H^+$ is added to ammonium hydroxide and ammonium chloride buffer?
  • More ammonium hydroxide is formed
  • Reaction will move reverse
  • Reaction will move forward✔️
  • No effect on equilibrium
Correct Answer Explanation
In $NH_4OH/NH_4Cl$ buffer, adding $H^+$ shifts the equilibrium: $NH_4OH + H^+ \rightarrow NH_4^+ + H_2O$. The reaction moves forward (Le Chatelier's principle), consuming the added $H^+$ and maintaining the pH.