Homework Answers
For maximum buffer capacity we need weak acid or weak base along with its conjugate with nearly same amount.
Option A is not suitable since HNO3 is strong acid. Option B is not a buffer . Option D is also not buffer as citric acid conjugate base is monosodium citrate ( in general sodium citrate means trisodium citrate which is not conjugate base of citric acid
Option C is answer
HF is weak acid and NaF is its conjugate base.
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