Question

Potassium hydrogen phthalate is a solid, monoprotic acid frequently used in the laboratory to standardize strong base solutions. It has the unwieldy formula of KHC8H4O4. This is often written in shorthand notation as KHP. If 2.20 grams of KHP are needed to exactly neutralize 31.2 mL of a potassium hydroxide solution, what is the concentration of the base solution ?

ANSWER: is in M potassium hydroxide

Answer 1

Balanced equation: | KHC,H,O + KOH +K,C,H,O, HÀO Mass of KHC,H,O4 = 2.20g Number of moles of KHC,H,04 = 2.20gx mole 13:04 = 2.203 204.23g = 0.0108mole Number of moles of KOH is needed =0.0108 mole KHC,H.04 - mole KOH | mole KHC,H,O, = 0.0108mole KOH Volume of the solution=31.2mL x 1000mL = 0.0312 L Concentration of KOH=- 0.0108mole 0.0312L =0.345 mole Hence, the molarity of the KOH is 0.345M