A pure sample of a monoprotic acid is dissolved in water. The sample is titrated with sodium hydroxide solution. At the point where 20.0 mL of the NaOH solution has been added, the pH is 4.15. The phenolphthalein endpoint of the titration is observed when 50.0 mL of NaOH have been added. What is the pKa of the acid? (A) 4.15  (B) 4.33  (C) 4.55  (D) 5.19 Correct answer is B but I can't figure out how to get that answer. Please show your work.

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