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A 1.00 L buffer solution is 0.250 M in HF and 0.250 M in LiF. Calculate the pH of the solution after the addition of 0.150 moles of solid LiOH. Assume no volume change upon the addition of base. The Ka for HF is 3.5x10^-4. a) 4.24 b) 3.63 c) 2.85 d) 3.46 e) 4.06