RelativeResourceManager(7) - 250g 0.01g x 1,000,000 = 40...

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7 of 17 (e) Example 1 . Given: a group of 100 students, of which 27 are female. Determine: (a) the % of females, (b) the ppm females. (a) % = cases of number total cases of number x 100 % females = 100 27 x 100 = 27 (b) ppm = cases of number total cases of number x 1,000,000 ppm females = 100 27 x 1,000,000 = 270,000 or ppm = % x 10,000 00 = 27 x 10,000 = 270,000 Example 2. Given: 0.01 g of cadmium (Cd) is found in 250g of sewage sludge. Determine: (a) % Cd in sludge, (b) ppm Cd in sludge. (a) % Cd = 250g 0.01g x 100 = 0.004 (b) ppm Cd =
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Unformatted text preview: 250g 0.01g x 1,000,000 = 40 III. pH, Exponents, and Logarithms A. pH pH is defined as the negative logarithm of the hydrogen ion activity (pH = -log a H ). For our purposes, the concentration of hydrogen ion approximates the activity (a H = [H + ]). In every liter of pure water, 1 x 10-7 moles of water are dissociated into 1 x 10-7 moles of H+ and 1 x 10-7 moles of OH-. H 2 O H + + OH-pH = -log 10-7 = 7 pOH = -log 10-7 = 7 Therefore pOH + pH = 14....
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This note was uploaded on 06/21/2011 for the course NRES 201 taught by Professor Olson,k during the Spring '08 term at University of Illinois, Urbana Champaign.

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