Problem: 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 d) 0.50 e) none of these

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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

d) 0.50

e) none of these

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