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Question: enve 44085508 water and wastewater quality problem set no1 concentration...

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ENVE 4408/5508: Water and Wastewater Quality Problem set No.1: Concentration Units Atomic mass: Na 22.99: C- 12.01: O-16.00: H-101:C1-3545: P 30.97 (Report the concentrations at least 4 significant figures 1. (Sato) How to make 1 L of 0.02-NNa CO, solution; that is, convert the unit from N (eq/L) to mg/L Note: Nado, 2Na+ +CO- 2. (Sato). What is 1.0 mg/L Na:HPO4 solutions in M (mol/L). 3. (FE exam) A water sample contains 57 mg/L of phosphate (POsured as substance PO). What is the concentration of PO as CaCOs? 4. (Sato) A 18 litters of simulated groundwater was prepared by adding reagent-grade salts to deionized water as follows: 0.0995 g of MgSO4, 0.1235 g of CaCl, 0.1865g of NaCl, and 0.3033 g NaHCO. What would be the result of the chemical analysis of this water? a) (20 pts) Complete the table attached (Table 1) below. b) (5 pts) Check ion balance. Is ion balance OK? c) (15 pts) Draw a bar graph for this water. (ENVE 5508 students drae a Stiff Diagram ako.) Note: Arrange cations in an order (sequence) of: Ca. Mg Na,K Arrange anions in an order (sequence) of OH, CO HCOSO.C1.NO,
2 of 3 Table 1. Composition of Simulated Groundwater Constituent MW mM (milimoles/L mole wt Cation 22.99 24.31 40.08 SUM CT SO4 HCO 35.45 96.064 61.01 SUM Step 1: Calculate molecular weight (MW) or formula weight (FW) of each constituent. Mg SO4 CaClz: NaCl NaHCO 22.99+61.01 -84.00 g/mole 24.31 +96.062-120.374 g/mole 40.08 +2(35.45) 110.98 g/mole 22.99 +35.45 -58.44 gmole Step 2: Calculate molar concentrations: moles/L (M) or milimoles/L (mM) Mg SO(0.0995 g/18 L)/(120.374 g/mole)-4.592x 10 M- 4592 x 102 mM CaClz NaCl: NaHCO: (0.3033 g/ 18 L)/(84.00 g/mole) -2.006 x10 M-2.006 x 10 mM (0.1235 g/ 18 L)/(11098 g/mole) - 6.182x10-5M-6.182x 102 mM (0.1865 g/ 18 L)/(5844 g/mole) 1.773 x 10 M-1.773 x 10 mM
Step 3: Calculate molar concentration (m, mM) for each ion species Mg SO4 4592 x 10 Mg2. 4.592 x 10 → SO .592 x 10- CaCl: 6.182 x 10 2C 6.182 x 10 2(6.182 x 10) →Na NaCl 1.773 x 10- 1.773 x 10 1.773 x 10 NaHCO3 2.006 x 10 → Na 2.006 x 10 HCO 2.006 x 10 Ion m.M milimoles/L (cation) Ca2+ Na moles/L 6.182 x 10 4592 x 10 (1.773 x 104) + (2.006 x 10) = 3.779 x 104 6.182 x 10 4.592 x 102 3.779 x 101 (anion) HCO 2.006 x 104 4.592 x 10 2(6.182 x 11.773 x 10 2.006 x 101 4.592 x 102 .0094 x 10 CI -3.0094 x 10 Step4. Calculate concentration (mg/L) for each species moles g mg L moles g Ca2 Mg2 ( 6, 182 x 10 moles/L)(4008 ginole)( 10-mg/g)-2.478 mg/L 4.592 x 10 moles/L)(24.31 g/mole(10 mg/g)-1.116 mg/L (3.779x 10 moles/L)(22.99 g/mole(10 mg/g)- 8.688 mg/L (anion) HCO so Cr (2.006 x 10 moles/L)(61.01 g/mole)(10 mg/g) -12.238 mg/L (4.592 x 10s moles/L)(96.064 g/molex 10 mg/g) 4.41 1 mgL 3.0094 x 10 moles/L)(35.45 g/mole)(10 mg/g)-10.6688 mg/L
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