90. A student needs a solution buffered at pH 4.30 ([H+ ] = 5.0×10−5 M). This student can choose from the following weak acids and their salts to prepare the buffer. Which system will own the best buffering capacity?
(A) Benzoic acid (Ka = 6.4 × 10-5 )
(B) Chloroacetic acid (Ka = 1.35 × 10-3 )
(C) Propanoic acid (Ka = 1.3 × 10-5 )
(D) Hypochlorous acid (Ka = 3.5 × 10-8 )
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