Which of the following could be a buffer? A)NaF(aq) B)HF(aq)+ NaF(aq) C)HF(aq)+ H₂O(l) D)NaF(aq)+ H₂O(l) E)NaCl(aq)+ HF(aq)

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A buffer is a solution that can resist changes in pH upon addition of small amounts of an acid or a base. In order to be a buffer, a solution must contain a weak acid (as a proton donor) and its conjugate base (as a proton acceptor), or a weak base (as a proton acceptor) and its conjugate acid (as a proton donor). Option B contains HF (a weak acid) and NaF (its conjugate base), which can function as a buffer. Option A contains NaF, which is not a weak acid or a weak base, and cannot function as a buffer. Option C contains HF and HSO4- (a strong acid), which cannot form a buffer. Option D contains NaF and HSO4-, which cannot form a buffer. Option E contains NaCl (a neutral salt) and HF, which cannot form a buffer.

Which of the Following Could Be a Buffer