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Which of the following represent a buffer system? Check all that apply.
A. NaOH and NaCl
B. H₂CO₃ and NaHCO₃
C. HF and KF
D. KCl and NaCl

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Answer:

B. H₂CO₃ (weak acid) and NaHCO₃ (conjugate base).

C. HF (weak acid) and KF (conjugate base).

Explanation:

a buffer system consists of a weak acid and its conjugate base, or a weak base and its conjugate acid.

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