# Problem: Which weak acid-conjugate base combination would be the best to create a solution with a pH of 4.193?      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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Which weak acid-conjugate base combination would be the best to create a solution with a pH of 4.193?

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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