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Potassium hydrogen phthalate, KHC8H4O4 (KHP) is often used to standardize solutions of bases. The acidic anion reacts with strong bases according to the following equation:

HC8H4O4-(aq) + OH-(aq) ? C8H4O42-(aq) + H2O( )

0.982 g sample of KHP (this is not potassium-hydrogen-phosphorus) is dissolved in water and titrated to the equivalence point with 26.45 mL of NaOH solution. What is the concentration (M) of the NaOH solution?

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