A buffer solution contains a mixture of aqueous ammonia, NH3(aq), and ammonium chloride NH4Cl(aq). A small...
A buffer solution contains a mixture of aqueous ammonia, NH3(aq), and ammonium chloride NH4Cl(aq). A small amount of sodium hydroxide solution, NaOH(aq) is added. Which of the following correctly describes the buffering action occurring in this solution on mixing?
- A. Hydroxide ions are removed by reaction with NH3(aq) to give NH4OH (aq)
- B. Sodium ions are removed by reaction with Cl- to give NaCl
- C. The presence of NH3 (aq) prevents the NaOH from dissociating into ions
- D. Hydroxide ions are removed by the reaction with NH4+ to give NH3 (aq)
- E. Hydrogen ions are removed by reaction with NH3 (aq) to give NH4+ ( aq)
Homework Answers
Ans: D (Hydroxide ion is base, it reacts with ammonium ion and will give water and ammonia. Therefore hydroxide ions are removed by the reaction with NH4+ to give NH3 (aq).
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