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Potassium acid phthalate, KHC8H4O4, is a crystalline solid that is available in a state of high purity, making it an excellent choice as a standard acid. What is the concentration of a NaOH solution, if it takes 62.00 mL to neutralize a 0.0778 g sample of the acid?

For the neutralization reaction, KHC8H4O4(aq) --> K+(aq) + H+(aq) + C8H4O42-(aq)

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