Acid Base Problem Set II

1. Several years ago, two garbage workers in New York City were exposed to hydrofluoric acid. This acid is usually sold in 500.0 milliliter Teflon bottles (It can not be stored in glass because it will dissolve the bottle!). It has a boiling point of 19.54 °C and a density of 0.991 g cm^-3. Hydrofluoric acid causes extremely severe chemical burns and is capable of dissolving bone. Hydrofluoric Acid Safety Video is available from filemedia. The Material Safety Data Sheet for HF is available from J.T.Baker.
   1. Write a balanced chemical equation that describes what happens when hydrofluoric acid is added to water.
   2. Write the equilibrium expression for this balanced chemical equation
   3. If the entire contents of this bottle is mixed into a 55 gallon barrel of water. What is the equlibrium concentration of HF, H₃O¹⁺, F^1-, and OH^1-? Clearly show your work and identify any assumptions that you make.

2. A solution is prepared by diluting 2.50 g of potassium fluoride to 250.0 mL with deionized water. Calculate the concentration of all the ions present in this solution at equlibrium. Clearly identify any assumptions that you make while solving this problem.

3. A solution is prepared by diluting 2.50 g of potassium chloride to 250.0 mL with deionized water. Calculate the concentration of all the ions present in this solution at equlibrium. Clearly identify any assumptions that you make while solving this problem.

4. A solution is prepared by adding 2.50 g of hydrochloric acid to 250.0 mL with deionized water. Calculate the concentration of all the ions present in this solution at equlibrium. Clearly identify any assumptions that you make while solving this problem.

Please send any comments, corrections, or suggestions to svanbram@science.widener.edu.

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Last Updated Tuesday, March 02, 1999 8:33:08 AM