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Unformatted text preview: Basic Chemical Concepts EVEG 3110 January 18, 2007 Units Mass kg, g, mg Volume (V) m 3 , L, ml, million gallon (MG) Flow (Q) m 3 /d, gal/min Concentration (C) ppm, meq/L, mg/L = g/m 3 , mol/L Mixing: Dose a solid Calculate the concentration of salt (NaCL) in a 200 gal bucket that has been dosed with 3 lbs of salt. C=M/V Mixing: Dose with a liquid Calculate the salt concentration in a container that has had 2 liters of 3 ppt saltwater added to it. Assume the original container contained 3 liters of water at 1 ppt and that it does not overflow. C= (m 1 + m 2 )/(v 1 +v 2 )=(c 1 v 1 +c 2 v 2 )/(v 1 + v 2 ) Blending concentrations A 8.3 gal/hr flow containing 2.5 ppt of salt is blended with a 6.2 gal/hr flow at 1.6 ppt. What is the concentration of salt in the blended flow. C=(mr1+mr2)/(q 1 +q 2 ) mr 1 =q 1 c 1 (mass rate 1 =flow 1* concentration 1) Or alternately C=(q 1 c 1 +q 2 c 2 )/(q 1 +q 2 )=q1/(q1+q2)*c 1 +q 2 /(q 1 +q 2 )*c 2 A weighted mean approach…check the units Periodic Table of the Elements Periodic Table Basics Atomic Weight of Chlorine? Valence of Calcium? Molecular Weight of Sodium Chloride? Concentration C=MASS/Volume Simple concentrations are important because they relate directly to mass which allows engineers to calculate dosing or removal amounts in common units. 1 mg/l = 1 g/m 3 = 1 ppm =1000 ppb Lbs/ft 3 Tons/acreft Molar Concentration (M/L) 1 mole/liter=6.02X10 23 molecules/L 6.02X10 23 molecules/L= 1 Molecular Weight/L So 1 mole/liter=1 Molecular Weight/L Molar concentrations are important because they related directly to the number of impacts between molecules which control the range of reactions 6.02 X 10 23 molecules per mole is Avogadro’s number Molarity Example What is the molarity of 200 ml of a solution containing 2.0 g of sodium chloride (NaCl). containing 2....
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 Spring '10
 Malone
 pH, equivalent weight

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