Problem: Potassium hydrogen phthalate (KHP) is often used as a primary standard in acid-base titration. If 20.65 mL of NaOH is required to neutralize 0.457 g of KHP, what is the concentration of the NaOH? 

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Potassium hydrogen phthalate (KHP) is often used as a primary standard in acid-base titration. If 20.65 mL of NaOH is required to neutralize 0.457 g of KHP, what is the concentration of the NaOH?