Which weak acid-conjugate base combination would be the best to create a solution with a pH of 7.538?
a) Butanoic acid and Potassium butanoate (Ka = 1.5 x 10 -5)
b) Benzoic acid and Sodium benzoate (Ka = 6.3 x 10 -5)
c) Acetic acid and Lithium acetate (Ka = 1.8 x 10 -5)
d) Ammonium chloride and Ammonia (Kb = 1.8 x 10 -5)
e) Hypochlorous acid and sodium hypochlorite (Ka = 2.9 x 10 -8)
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