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Question- A solution is prepared by dissolving 0.23 moles of hydrofluoric acid and 0.27 moles of sodium fluoride in water sufficient to yield 1.00L of solution. What is the pH after the addition of 0.05 mole of HCl? Assume that the volume does not change. (Ka= 6.8x10^-4 for hydrofluoric acid)

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