08_Lecture0

# Exercise 83 normal rain or snow has a ph between 65 to

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Unformatted text preview: er [H3O+], [OH-], pH, or pOH are known, the other three can be obtained! (Exercise 8.3) • Normal rain or snow has a pH between 6.5 to 5.0. • Note that this is a “log” scale. • Affected by concentration, nature of the acid or base, type of solvent, and temperature Difference in Determining pH of Concentrated and Dilute Solutions…Water! and • With strong acid or strong base, “what you see is what you get” (ignore any H+ or OH– from water if acid or base is concentrated). • However, in dilute solutions of SA or SB, check for possible contributions from water. • Use the mass balance equation: • [H+] = [H+]HA + [H+]water Weak Acid or Base—One More Consideration Consideration • First, additional contributions of water to H+ and OH– can generally be ignored if the concentration of the acid or weak base is above ~ 10-6 M, and also if the Ka or Kb is larger than 10-6. • Exercise 8.4 Use the following: Weak Acids and Weak Bases...Small Ka (Small Kb) • Trimethylamine (Kb = 6.35 × 10–5 ) is partially responsible for the aroma of fish. What would be the pH of a solution with an initial concentration of 0.0557M? • N3H9N + H2O N3H9N H+ + OH- Use Kb = (P/R); Kb = [N3...
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