Potassium Hydrogen Phthalate (KHP) Concentrations Can Be Determined Through Titrating

Potassium hydrogen phthalate (KHP) concentrations can be determined through titrating samples of KHP (a monoprotic acid) with bases such as NaOH in the presence of an indicator such as phenolphthalein. The indicator is colorless in an acidic solution and turns pink in an alkaline solution. Thus we can establish an equilibrium for the phenolphthalein as such:
HIn + H₂O In ⁻ + H₃O⁺
If the HIn species is the "acid color" or clear for the phenolphthalein and the In ⁻ species is the "base color" or pink for this particular indicator, what color will appear in a flask in which a 0.2993 gram sample of KHP has been totaled neutralized with an excess of NaOH?

A) the flask is colorless
B) the flask is pink
C) the flask is white from KCl precipitation
D) there is insufficient information to solve this problem

Correct Answer:

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