The following questions refer to a solution that contains 1.00 M hydrofluoric acid, HF (K a = 7.2 × 10–4), and 3.00 M hydrocyanic acid, HCN (K a = 6.2 × 10–10).
How many moles of benzoic acid, a monoprotic acid with K a = 6.4 × 10–5, must be dissolved in 500. mL of H2O to produce a solution with pH = 2.50? a) 1.6 × 10–1 b) 2.0 × 10–2 c) 7.8 × 10–2 d) 0.50 e) none of these
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