W9_acids_key - Chem 125 Winter 2008 Dr Retsek Worksheet 9...

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Chem 125 Dr. Retsek Winter 2008 Worksheet 9: Acid and Base Basics 1. For each of the following, determine [H 3 O + ], [OH - ], pH, pOH and whether or not the solution is acidic, basic, or neutral. a. A rainwater sample with a pH of 4.35 [H 3 O + ] = 4.5 x 10 -5 M; pOH = 9.65; [OH - ] = 2.2 x 10 -10 M; acidic b. An ammonia sample with a pH of 11.28 [H 3 O + ] = 5.2 x 10 -12 M; pOH = 2.72; [OH - ] = 1.9 x 10 -3 M; basic c. A 0.015 M solution of HCl (aq). [H 3 O + ] = 0.015 M; pH = 1.82; pOH = 12.18; [OH - ] = 6.6 x 10 -13 M; acidic d. A sample of Ca(OH) 2 with a concentration of 0.16 g Ca(OH) 2 /100.0 mL solution [H 3 O + ] = 2.3 x 10 -13 M; pH = 12.64; pOH = 1.36; [OH - ] = 0.044 M; basic e. A 3.00% KOH solution by mass that has a density of 1.0242 g/mL [H 3 O + ] = 1.8 x 10 -14 M; pH = 13.74; pOH = 0.26; [OH - ] = 0.548 M; basic 2. The following is a list of weak acids and their K a values: HOCl hypochlorous acid 3.5 x 10 -8 H 2 S hydrogen sulfide 1.1 x 10 -7 HCN hydrocyanic acid 4.0 x 10 -10 HNO 2 nitrous acid 4.5 x 10 -4 a. Which acid given above is the strongest? Explain your choice. HNO 2 with largest K a b. Write the K a expression for the strongest acid. K a = [H 3 O + ][NO 2 1- ]/[HNO 2 ] = 4.5 x 10 -4 c. Which acid has the strongest conjugate base?
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  • Winter '08
  • Retsek
  • Chemistry, pH, Kc, Dr. Retsek, base2 acid2 base1

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