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Homework Answers
(a) The carbonate hardness is majorly contributed by the species HCO3^-. Hence, the carbonate hardness is 250 mg/L
(b) Ca^2+ exhibits both carbonate and non-carbonate hardness.
i.e. The carnonate hardness of Ca^2+ = 225 mg/L
Mg^2+ and SO4^2- contributes to both carbonate and non-carbonate.
Here, the carbonate hardness of Mg^2+ and SO4^2- = 100 + 75 = 175 mg/L
Here, the carbonate hardness of Ca^2+ = (carbonate hardness + non-carbonate hardness) of Mg^2+ and SO4^2-.
Therefore, non-carbonate hardness = 225 - 175 = 50 mg/L
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The solutions are written under the question, but I need to know how the answer was found.
(35 points) For the following water sample please complete the table (meq/L and mg/L as CaCO3) and the questions that f...
(35 points) For the following water sample please complete the table (meq/L and mg/L as CaCO3) and the questions that follow (Remember - 50 mg CaCO3/meq CaCO3) lon mg/L mg/meq meq/L (Please fill in the values below) as CaCO3 mg/L HCO3 125 61.0 2- 35 250 30.0 Mg K* Fe2 Mn2+ SO.2 NO3 NO2 Ca2 12.2 100 39.1 27.9 175 12 27.5 300 48.0 62.0 2 0.1 46.0 155 125 20.0 CI Na* 35.5 25 23.0 pH 7.0 (15 points)...
(8 points) A source water mineral analysis shows the following ion concentrations in the water: Ca2+...
(8 points) A source water mineral analysis shows the following ion concentrations in the water: Ca2+ 70 mg /L, Mg2+ 40 mg /L, and HCOs 250 mg /L as CaCOs. Determine the water's carbonate hardness, noncarbonated hardness, and total hardness.
The chemical composition of a water sample is given in the table below. The goal hardness...
The chemical composition of a water sample is given in the table below. The goal hardness is 80 mg/L as CaCO3 Water composition (mg/L): Ca2+ HCO3 15 SO42- Na* CO2 242 Mg2+ 56 (a) Convert the given ionic concentrations in mg/L to mg/L as CaCO3 (b) What is the total hardness, carbonate hardness and non-carbonate hardness? (C) What is the lime-soda dosage to soften the water to a hardness of 80 mg/L as CaCO3 (d) What is the annual cost...
0.1001 Sample Volume ViEDTA VI EDTA 0135L 02して'8_1 O1241L AVEDTA ,moles EDTA moles EDTA Moles E...
0.1001 Sample Volume ViEDTA VI EDTA 0135L 02して'8_1 O1241L AVEDTA ,moles EDTA moles EDTA Moles EDTA Molesca2. Sample [Ca2* moles Ca moles Ca2 mg CaCO3 mg CaCO3 Sample Hardness USGS Hardness Classification mg CaCO3 Accepted Hardness % Error Chemicals, Materials and Equipment Eriochrome Black T indicator solution (0.4 g/L) Disodium EDTA solution (0.0100 M) Ammonia/Ammonium Chloride Buffer (pH 10) Magneisum Chloride Solution (1x103 M) Saturated CaSO4 solutions previously prepared and equilibrated to 60°C and 90°0C hot/stir plate 60°C and 90°C...
3. Determine the lime and soda ash dose, in mg/L as Ca(OH)2 and Na2CO3, to soften...
3. Determine the lime and soda ash dose, in mg/L as Ca(OH)2 and Na2CO3, to soften the water of a village to a final hardness of 40.0 mg/L as CaCO3. Chemical analysis showed that the water contains Na+ (50 mg/L), Ca2+ (150 mg/L), Mg²+ (30 mg/L, HCO3 (100 mg/Las CaCO3), Cl (80 mg/L). and CO2 (5.0 mg/L).
A sample of water from Brazos River at Brenham was collected and analyzed by PVAMU students...
A sample of water from Brazos River at Brenham was collected and analyzed by PVAMU students for water quality characteristics. The following data was reported on the chemical analysis. The temperature and pH of the water are 25°C and 7.2, respectively. 9. Ion Conc. g/m3 84.6 Ca+2 Mg+2 32.2 Na+ 53.2 12.6 0.85 Fe+3 нсоз. | 256.9 SO42 88.9 CO32 14 Cl- 99.7 Calculate the concentration of ions in eq/m3 and mg/l as CaCOs (show AW and EW for each...
(6 points) A chemical analysis of a surface water sample yields the following data: Concentration (mg/L)...
(6 points) A chemical analysis of a surface water sample yields the following data: Concentration (mg/L) Ion Ca2+ Mg2+ Fe2 K+ CI SO..2 HCO, CO;2- pH a. Find the alkalinity (in mol/L) b. Find the hardness as mg CaCO/L.
. 5 points. Using Eq. 4-17 (shown below) calculate the dose of calcium hydroxide in mg...
. 5 points. Using Eq. 4-17 (shown below) calculate the dose of calcium hydroxide in mg Ca(OH)2/L needed to remove the magnesium in a water containing 124 mg MgCl2/L. Ignore subsequent soda ash requirements to remove the added calcium Hint: use one mole of lime per mole of magnesium. Note: this is non-carbonate hardness . 5 points. Briefly explain the formation of "soap scum" in terms of the chemical elements in hard water and "natural" soap. Ca2* Na2CO3 CaCO3(s)2 Na*...
Please need ASAP Problem 1 (25 pts) The influent water to a water treatment plant that treats 50x10° L/day has a pH of 7.5 and the following composition: eqmolW (g/mol) [1 | (me/L) | [1 (mg/L...
Please need ASAP
Problem 1 (25 pts) The influent water to a water treatment plant that treats 50x10° L/day has a pH of 7.5 and the following composition: eqmolW (g/mol) [1 | (me/L) | [1 (mg/L as CaCO) L) mg/L) | H2COs 100 2 62.0 3.2 161.3 Ca2 100 2 40.0 5.0 250.0 Mg2 40 2 24.4 3.3 163.9 Nat 43.5 20 0.9 23.0 300.0 300 100.0 6.0 ALK 114.6 2.3 96.0 110 SO1 a) Write the chemical reactions controlling...
Based on question 2, how would you go about solving question number 9? Please solve question...
Based on question 2, how would you go about
solving question number 9? Please solve question number 2 and 3 if
possible.
2. (10 points) A groundwater in California has the following water quality characteristics. From the analysis shown below, determine the total hardness, carbonate hardness and noncarbonate hardness of the groundwater. Express your answers in units of mg/L as CaCO3 and as meq/L. Constituent Units Concentration or Value 10 90 40 30 10 3.1 Carbon Dioxide (CO2) Calcium (Ca2+)...
(35 points) For the following water sample please complete the table (meq/L and mg/L as CaCO3) and the questions that follow (Remember - 50 mg CaCO3/meq CaCO3) lon mg/L mg/meq meq/L (Please fill in the values below) as CaCO3 mg/L HCO3 125 61.0 2- 35 250 30.0 Mg K* Fe2 Mn2+ SO.2 NO3 NO2 Ca2 12.2 100 39.1 27.9 175 12 27.5 300 48.0 62.0 2 0.1 46.0 155 125 20.0 CI Na* 35.5 25 23.0 pH 7.0 (15 points)...
(8 points) A source water mineral analysis shows the following ion concentrations in the water: Ca2+ 70 mg /L, Mg2+ 40 mg /L, and HCOs 250 mg /L as CaCOs. Determine the water's carbonate hardness, noncarbonated hardness, and total hardness.
The chemical composition of a water sample is given in the table below. The goal hardness is 80 mg/L as CaCO3 Water composition (mg/L): Ca2+ HCO3 15 SO42- Na* CO2 242 Mg2+ 56 (a) Convert the given ionic concentrations in mg/L to mg/L as CaCO3 (b) What is the total hardness, carbonate hardness and non-carbonate hardness? (C) What is the lime-soda dosage to soften the water to a hardness of 80 mg/L as CaCO3 (d) What is the annual cost...
0.1001 Sample Volume ViEDTA VI EDTA 0135L 02して'8_1 O1241L AVEDTA ,moles EDTA moles EDTA Moles EDTA Molesca2. Sample [Ca2* moles Ca moles Ca2 mg CaCO3 mg CaCO3 Sample Hardness USGS Hardness Classification mg CaCO3 Accepted Hardness % Error Chemicals, Materials and Equipment Eriochrome Black T indicator solution (0.4 g/L) Disodium EDTA solution (0.0100 M) Ammonia/Ammonium Chloride Buffer (pH 10) Magneisum Chloride Solution (1x103 M) Saturated CaSO4 solutions previously prepared and equilibrated to 60°C and 90°0C hot/stir plate 60°C and 90°C...
3. Determine the lime and soda ash dose, in mg/L as Ca(OH)2 and Na2CO3, to soften the water of a village to a final hardness of 40.0 mg/L as CaCO3. Chemical analysis showed that the water contains Na+ (50 mg/L), Ca2+ (150 mg/L), Mg²+ (30 mg/L, HCO3 (100 mg/Las CaCO3), Cl (80 mg/L). and CO2 (5.0 mg/L).
A sample of water from Brazos River at Brenham was collected and analyzed by PVAMU students for water quality characteristics. The following data was reported on the chemical analysis. The temperature and pH of the water are 25°C and 7.2, respectively. 9. Ion Conc. g/m3 84.6 Ca+2 Mg+2 32.2 Na+ 53.2 12.6 0.85 Fe+3 нсоз. | 256.9 SO42 88.9 CO32 14 Cl- 99.7 Calculate the concentration of ions in eq/m3 and mg/l as CaCOs (show AW and EW for each...
(6 points) A chemical analysis of a surface water sample yields the following data: Concentration (mg/L) Ion Ca2+ Mg2+ Fe2 K+ CI SO..2 HCO, CO;2- pH a. Find the alkalinity (in mol/L) b. Find the hardness as mg CaCO/L.
. 5 points. Using Eq. 4-17 (shown below) calculate the dose of calcium hydroxide in mg Ca(OH)2/L needed to remove the magnesium in a water containing 124 mg MgCl2/L. Ignore subsequent soda ash requirements to remove the added calcium Hint: use one mole of lime per mole of magnesium. Note: this is non-carbonate hardness . 5 points. Briefly explain the formation of "soap scum" in terms of the chemical elements in hard water and "natural" soap. Ca2* Na2CO3 CaCO3(s)2 Na*...
Please need ASAP
Problem 1 (25 pts) The influent water to a water treatment plant that treats 50x10° L/day has a pH of 7.5 and the following composition: eqmolW (g/mol) [1 | (me/L) | [1 (mg/L as CaCO) L) mg/L) | H2COs 100 2 62.0 3.2 161.3 Ca2 100 2 40.0 5.0 250.0 Mg2 40 2 24.4 3.3 163.9 Nat 43.5 20 0.9 23.0 300.0 300 100.0 6.0 ALK 114.6 2.3 96.0 110 SO1 a) Write the chemical reactions controlling...
Based on question 2, how would you go about
solving question number 9? Please solve question number 2 and 3 if
possible.
2. (10 points) A groundwater in California has the following water quality characteristics. From the analysis shown below, determine the total hardness, carbonate hardness and noncarbonate hardness of the groundwater. Express your answers in units of mg/L as CaCO3 and as meq/L. Constituent Units Concentration or Value 10 90 40 30 10 3.1 Carbon Dioxide (CO2) Calcium (Ca2+)...
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