How many moles of benzoic acid, a monoprotic acid with Ka = 6.4 x 10 -5, must be dissolved in 500. mL of H2O to produce a solution with pH = 2.50?
a) 1.6 x 10 -1
b) 2.0 x 10 -2
c) 7.8 x 10 -2
e) none of these
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