# pH Stoichiometry by fjwuxn

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```									                                 pH Stoichiometry
1. 0.81 g of aluminum hydroxide dissolves in 400.0 mL of solution. Assuming
complete ionization, calculate the molar hydroxide ion concentration ([OH-]), the
pOH, pH, and the molar hydrogen ion concentration ([H+]) of the solution.

2. Calculate the molar hydrogen ion concentration ([H+]), the pH, pOH, and molar
hydroxide ion concentration ([OH-]) of 500.0 mL of 0.05 M sulfurous acid solution.
Assume complete dissociation.

3. A solution of strontium hydroxide has a pH of 9.80. Calculate the pOH, the molar
hydroxide ion concentration ([OH-]), and the molar hydrogen ion concentration ([H+])
of the solution.

4. A 150 mL solution of sodium hydroxide is found in a chemical storage cabinet.
Using pH paper, the pH of the solution was determined to be 12.4. If the solution is
left to evaporate to dryness, what mass of sodium hydroxide will crystallize in the
container?

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Acid & Base Neutralization Stoichiometry
5. Write the balanced neutralization equation when a solution of magnesium hydroxide
is combined with hydroiodic acid.

6. Write the balanced neutralization equation when solutions of phosphoric acid and
beryllium hydroxide are mixed. Assume the acid completely dissociates in solution.

7. 22.50 mL of 0.10 M lithium hydroxide reacts completely with 30.0 mL of
hydrobromic acid. What is the concentration of the acid?

8. 9.81 mL of 0.05 M hydrochloric acid reacts completely with 15.00 mL of barium
hydroxide solution. Calculate the concentration of the base and its associated pH.

9. Acetylsalicylic acid, abbreviated ASA, is the active ingredient in Aspirin. Pretend
that the rule for competitive Olympic athletes is that they are not allowed to have
more than 50 mg of acetylsalicylic acid in their urine. A urine sample is tested with
the following results.

45.0 mL of 0.10 M NaOH reacts completely with the ASA in the urine sample. How
much ASA was found in the athlete’s body? Will the athlete be banned from the
games or can she still participate? The formula for ASA is HA and it has a formula
mass of 180 g/mol. Note also that 1000 mg = 1 g