7. Is the ammonia/ammonium chloride system a buffer system? Why or why not? sea

Question

7. Is the ammonia/ammonium chloride system a buffer system? Why or why not? sea node by niving asoluble Concound that wrth solut ton c Contairs conjbgate oase Ocid When strong acid is added to the ammonia/ammonium chloride solution, which component is reacting with the HC1? How are the equilibria affected? In which direction do these systems shift? (Look at numbers 3 and 5 for equilibrium reactions.) 8. Remember that water is always undergoing autoionization. Write out this chemical reaction. 9. OH 10. When strong base is added to the system, which species is reacting with it? How are the equilibria affected? In which direction do these systems shift? (Look at numbers 3 and 5 for equilibrium reactions.)

Explanation / Answer

Q.7: Yes, because ammonia is a weak base and ammonium ion is a conjugate acid of ammonia. Hence they form a basic buffer.

Q.8: when HCl is added it reacts with weak base ammonia to form ammonium ion.

NH3(aq) + HCl(aq) ----- > NH4Cl(aq)

Hence when HCl is added more and more NH4Cl is formed shifting the equilibrium towards ammonium chloride.

Q.10: When a strong base like NaOH is added it reacts with the conjugate acid ammonium chloride.

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

Since more and more ammonia is formed, the equilibrium shifts towards ammonia.

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