Group 8:
Loni Kuang, Victor Lee, Jimmy Li, Angel Huang, Carolyn Fung

AP Chemistry, Mr. Fong

May 30, 2009

Mods 14/15

Titration Problems

1.   A student titrates an unknown amount of potassium hydrogen phthalate (KHC₈H₄O₄, often abbreviated KHB) with 30.45 mL of a 0.2000 M NaOH solution. KHB (molar mass=204.22 g/mol) has one acidic hydrogen. What mass of KHB was titrated (reacted completely) by the sodium hydroxide solution?

2.   The concentration of a certain sodium hydroxide solution was determined by using the solution to titrate a sample of potassium hydrogen phthalate (abbreviated KHP). KHP is an acid with one acidic hydrogen and molar mass of 204.22 g/mol. In the titration 44.35 mL of the sodium hydroxide solution was required to react with 0.1234 g KHP. Calculate the molarity of the sodium hydroxide.