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TEST-2B Key

# TEST-2B Key - YELLOW Introduction to Environmental...

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YELLOW Introduction to Environmental Engineering (CE 3501) EXAM 2 4/1/10 Name PART A: SHORT ANSWER, 4 points each 1. What produces acid rain? a. H 2 O + SOx b. H 2 O + ozone c. H 2 O + NOx d. a and c e. all of the above You have a water that contains the following: 85 mmol/L Ca 2+ 26 mmol/L Mg 2+ 132 mmol/L Na + 25 mmol/L K + 19 mmol/L SO 4 2- 145 mmol/L Cl - 196 mmol/L HCO 3 - 2. What is its alkalinity? a. 628 mmol/L b. 379 mmol/L c. 360 mmol/L d. 196 mmol/L e. 215 mmol/L ?????????? = 𝐻?? 3 + 2 ?? 3 2 + ?𝐻 − 𝐻 + Assuming a neutral pH the carbonate, hydroxide and hydrogen concentrations will be negligible. Thus: alkalinity = barcarbonate concentration=196. 3. What is the total hardness of the water? a. 268 mmol/L b. 111 mmol/L c. 130 mmol/L d. 379 mmol/L e. 628 mmol/L ?𝐻 = ?? 2+ + ?? 2+ = 85 + 26 = 111

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4. What is the non-carbonate hardness of water (in very general terms)? You walk into a lab and find an aerated water sample (t=0). The sample is labeled and shows that it was collected exactly 4 days earlier (t=-4). You begin a BOD test on the water sample by
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