CHEM 304 – 4/11/12 III. Water Chemistry • Introductory Points

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CHEM 304 – 4/11/12 III. Water Chemistry • Introductory Points • Physical processes: Water Cycle, etc. • Overview of Chemical Processes • Solubility Calcs. READ: Chapter 13 (I am following this). Quiz #5 Average = 27/30 (Nice Job!) EARTH DAY FESTIVAL In Owen Park Tomorrow (Fine Arts = Rain Site)

Key questions for Environmental Chemistry What is out there? (i.e. what is the chemical composition of some Earth system, e.g. a lake, clean air, dirty air, etc.) How, Why, and is it changing? (i.e. what factors led to current composition?, what be be driving changes? Local? Global?) Is human activity a factor? (i.e. are we causing #3?)

Gas Solubility: The Henry’s Law Constants for Ar and N2 (at 298K) are 1.4 x 10-3 and 6.1 x 10-4. Which has the greater solubility? Which would have the greatest ambient/saturated concentration?

Solubility of solids – Qualitative …

The Ksp’s of a few Lead Salts are: Pb(CO3): 7.4 x 10-14 Pb(OH)2: 1.2 x 10-15 Pb(SO4): 1.6 x 10-8 Pb(S)*: 3.0 x 10-28 Which of these is most likely to persist, and thus be the comprise a main component of a lead ore?

Ksp’s of Fe(OH)3 is 4.0 x 10-38. what is the concentration of Fe (i.e. [Fe+3]) at saturation? Ignore acid base chem. Noting that [OH-] = 10-6 (at pH=8)