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pH Stoichiometry

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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?




            www.pembinatrails.ca/shaftesbury/mrdeakin  adeakin@pembinatrails.ca
        (204) 888-5898  Shaftesbury High School, 2240 Grant Ave, Wpg, MB, R3P 0P7
                  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




            www.pembinatrails.ca/shaftesbury/mrdeakin  adeakin@pembinatrails.ca
        (204) 888-5898  Shaftesbury High School, 2240 Grant Ave, Wpg, MB, R3P 0P7

				
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