Potassium acid phthalate, KHP (KHC_8H_4O_4), is a primary standard reagent used

Question

Potassium acid phthalate, KHP (KHC_8H_4O_4), is a primary standard reagent used to determine exactly the concentration of a solution of base, such as NaOH, whose approximate concentration is known. KHP is a weak acid, and the equation for the neutralization of KHP by NaOH is Ahmed Zuwail dissolved 0.38 grams of KHP in 50.0 mL of water. He found out that it required 17.5 mL of NaOH to reach the endpoint of the titration. How many moles of the acid, KHP, were originally present before the addition of the base? Calculate the concentration of the NaOH solution?

Explanation / Answer

number of moles = weight / molecular weight

moles of KHP = 0.38 / 204.22 = 0.002 moles KHP present

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