Assign_1-1_Mass_and_Conc

# Assign_1-1_Mass_and_Conc - 6 It is known that...

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Mass and Concentration Calculations Assume that all chemicals are conservative (non reacting) for the purposes of these calculations. Use the molecular weights off of the attached table. 1) One 5 pound bag of salt (NaCl) is added to a 200 galllon plastic tub. What is the Salt concentration in ppt (grams/L). 2) One 5 pound bag of salt (NaCl) is added to a 200 gallon plastic tub. What is the resulting chloride concentration (Cl - ). Express results in terms of grams-Cl - /L. 3) 2.5 grams of limestone (pure CaCO 3 ) is dissolved in to a 1 m 3 reactor. What is the Calcium (Ca ++ ) reactor concentration? Express as mg-Ca ++ /L. 4) A well aerated 200 liter tub containing 20 mg/L of iron receives and additional iron dose of 3 grams. What is the resulting iron concentration. Express as mg-Fe +++ per liter.

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5) A 30 gallon container is known to have a free copper concentration of 3 mg/L. What is the molar (M) concentration of free copper in the container? Express as moles-Cu ++ /L. How many copper ions does the container hold?

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Unformatted text preview: 6) It is known that limestone (CaCO 3 ) dissociates in water: CaCO 3 Ca ++ + CO 3- -What is the Molar concentration of Ca + + in a 1.5 M 3 reactor after 3 grams of CaCO 3 have dissolved. Express results in moles-Ca ++ per liter. 7) A 3 gallon bucket contain a .0003 M/L of Ca++ is mixed with a 6 gallon bucket containing 75 mg/L of Ca ++ . What is the resulting Ca ++ (express as mg-Ca ++ /L) ? 8) How much salt must be added to a 200 acre flooded field to raise the salinity to 3 ppt. Assume the average depth of the water is 2.5 feet. (express in metric tons) 9) The 4 acre College Lake has an average depth of 4 feet. How many pounds of algal biomass are in the lake if the suspended algal concentration is 40 mg/L. 10) A stream with a 3 CFS flow and a phosphorus concentration of 20 ug/l is polluted with a 4 gpm waste stream with a phosphorus concentration of 15 mg/l. What is the phosphorus concentration in the stream below the waste input? (express in ug/L)....
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## This note was uploaded on 05/20/2010 for the course EVEG 3110 taught by Professor Malone during the Spring '10 term at LSU.

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Assign_1-1_Mass_and_Conc - 6 It is known that...

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