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7: Shift Happens
HW 5: Titration Calculations
Name:
Class:
Date:
1. What is the pH of an HCl solution if [H+] = 0.03? What is the pOH? Is the solution acidic
or basic?
2. The reaction of sulfuric acid (H2SO4) with potassium hydroxide (KOH) is described by the
equation:
H2SO4 + 2KOH → K2SO4 + 2H2O
Suppose 50 mL of KOH with unknown concentration is placed in a flask with
bromothymol blue indicator. A solution of 0.10 M H2SO4 is dripped into the KOH
solution. After exactly 33.4 mL of H2SO4 is added, the indicator changes from blue to
yellow. What is the concentration of the KOH?
a. Using the volume and molarity of the H2SO4, determine how many moles of H2SO4
there are (remember: M = moles/ liters).
b. Use the moles of H2SO4 and the balanced equation to determine how many moles
of KOH reacted.
c. Use the moles of KOH you calculated and the volume of KOH to find the molarity
of the KOH (remember: M = moles/ liters).
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3. KHP (KHC8H4O4) reacts with NaOH according to the following equation.
KHC8H4O4 + NaOH  KNaC8H4O4 + H2O
Mass of KHP Used
Molar Mass of KHP (KHC8H4O4)
Initial (Starting) Volume on Buret
Final (Ending) Volume on Buret
1.56 grams
15.07 mL
48.75 mL
a. Find the molar mass of KHP (KHC8H4O4).
b. Using the mass of KHP used, the molar mass of KHP, and the balanced equation,
determine how many moles of NaOH reacted (stoichiometry).
c. Using the moles of NaOH and the volume of NaOH, determine the concentration
of the NaOH solution.