Question

Potassium hydrogen phthalate is a solid, monoprotic acid frequently used in the laboratory as a primary standard. It has the unwieldy formula of KHC,H,O. This is often written in shorthand notation as KHP. If 21.7 mL of a barium hydroxide solution are needed to neutralize 0.993 grams of KHP, what is the molarity of the barium hydroxide solution? M

Answer 1

KHP is mono basic acid

barium hydroxide is di basic aicd.

both reacts in 2 : 1 ratio

moles of KHP = mass / molar mass = 0.993 / 204.22

moles of KHP = 0.00486

0.00486 moles KHP require 0.00486 / 2 = 0.00243 moles Ba(OH)2

moles = M x V in L

0.00243 = M x 21.7 / 1000

0.00243 = M x 0.0217

M = 0.112

[Ba(OH)2] = 0.112 M