Problem: 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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Problem Details

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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