Which of the following is a buffer system?

a. HCI and NaOH b. NH4OH and NH4Cl c. NaCl and NaOH d. HF and NaF e. b and d

Answer:
B

A buffer system is a weak acid and its conjugate base (or a weak base and its conjugate acid). NH4OH is a weak base. NH4Cl is also weak.

HCL is strong, so A is wrong. NaOH is strong, so its wrong. D is wrong becase NF is strong.
B. NH4OH and NH4Cl
e) b and d
First you should know your strong acids and strong bases

HCl, HNO3, H2SO4, HClO4, HBr, HI are your strong acids

NaOH, LiOH, KOH, RbOH, Ba(OH)2, Sr(OH)2, NH4OH, Ca(OH)2 are all strong bases

A buffer is made from a weak acid and the salt (usually Na Or K containing ) of its conjugate base

Since HF is a weak acid and NaF is the salt of its conjugate base, the answe is d

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