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Clearly indicate your selection to answer the following questions. 3.1 You did a test using precipitation titration with silver nitrate. To prepare the solution you added 6.25 gram of AgNO, in 1000 ml. distilled water. What is the normality you prepared? a) 0.037 mole/L b) 0.025 mole/L c) 0.015 mole/L d) 0.011 mole/L 3.1 Using the two criteria for BOD test: depletion of oxygen should be > 2 mg/L. and DO should not drop below 2 mg/L, and given the initial DO of 8.5 mg/L and a 2 mL sample is used in the test, what BOD range can the test cover? d) 850-990 mg/L a) 354-675 mg/L b) 220-855 mg/L c) 300-975 mg/L 3.2 You did hardness test by titrating EDTA solution with normality of 0.02 on a beaker containing a 100 ml. sample. The initial reading was 25 mL of EDTA. To reach the endpoint where the Erichrome Black-T changed its color from red to blue the final reading was 100 mL. The total hardness measured in mg/L as CaCO3 is: a) 155 b) 280 c) 650 d) 750 3.3 A 20°C sample is initially saturated with oxygen. Saturated seeded dilution water is used to obtain a 1:25 dilution. The final DO of the seeded dilution water is 8.2 mg/L while the final DO of the diluted sample is 2.8 mg/L. What is the 5-day BOD? a) 90 mg/L b) 152 mg/L c) 80 mg/L d) 136 mg/L 3.4 You did chloride test using precipitation titration with silver nitrate with molarity of 0.1 mole/L. You decided to use a sample size of 40 mL. You used 78 mL of this solution to reach the point where the color of the sample turns brackish or reddish brown. What is the concentration of CI in mg/L in the sample? a) 5250 mg/L b) 6501 mg/L c) 6914 mg/L d) 7405 mg/L 3.5 Results from jar test in lab to determine the best alum dose in a DWTP came in as in table below, the best dose is: Alum dose, mg/L 1 2 4 6 8 10 Turbidity, NTU 19.2 a) 2 mg/L b) 4 mg/L 12.6 c) 5 mg/L 10.5 8.6 8.2 7.4 d) 6 mg/L e) not in range

Clearly indicate your selection to answer the following questions. 3.1 You did a test using precipitation titration with silver nitrate. To prepare the solution you added 6.25 gram of AgNO, in 1000 ml. distilled water. What is the normality you prepared? a) 0.037 mole/L b) 0.025 mole/L c) 0.015 mole/L d) 0.011 mole/L 3.1 Using the two criteria for BOD test: depletion of oxygen should be > 2 mg/L. and DO should not drop below 2 mg/L, and given the initial DO of 8.5 mg/L and a 2 mL sample is used in the test, what BOD range can the test cover? d) 850-990 mg/L a) 354-675 mg/L b) 220-855 mg/L c) 300-975 mg/L 3.2 You did hardness test by titrating EDTA solution with normality of 0.02 on a beaker containing a 100 ml. sample. The initial reading was 25 mL of EDTA. To reach the endpoint where the Erichrome Black-T changed its color from red to blue the final reading was 100 mL. The total hardness measured in mg/L as CaCO3 is: a) 155 b) 280 c) 650 d) 750 3.3 A 20°C sample is initially saturated with oxygen. Saturated seeded dilution water is used to obtain a 1:25 dilution. The final DO of the seeded dilution water is 8.2 mg/L while the final DO of the diluted sample is 2.8 mg/L. What is the 5-day BOD? a) 90 mg/L b) 152 mg/L c) 80 mg/L d) 136 mg/L 3.4 You did chloride test using precipitation titration with silver nitrate with molarity of 0.1 mole/L. You decided to use a sample size of 40 mL. You used 78 mL of this solution to reach the point where the color of the sample turns brackish or reddish brown. What is the concentration of CI in mg/L in the sample? a) 5250 mg/L b) 6501 mg/L c) 6914 mg/L d) 7405 mg/L 3.5 Results from jar test in lab to determine the best alum dose in a DWTP came in as in table below, the best dose is: Alum dose, mg/L 1 2 4 6 8 10 Turbidity, NTU 19.2 a) 2 mg/L b) 4 mg/L 12.6 c) 5 mg/L 10.5 8.6 8.2 7.4 d) 6 mg/L e) not in range

Solid Waste Engineering
Solid Waste Engineering
3rd Edition
ISBN:9781305635203
Author:Worrell, William A.
Publisher:Worrell, William A.
Chapter5: Separation Processes
Section: Chapter Questions
Problem 5.18P
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Clearly indicate your selection to answer the following questions. 3.1 You did a test using precipitation titration with silver nitrate. To prepare the solution you added 6.25 gram of AgNO, in 1000 ml. distilled water. What is the normality you prepared? a) 0.037 mole/L b) 0.025 mole/L c) 0.015 mole/L d) 0.011 mole/L 3.1 Using the two criteria for BOD test: depletion of oxygen should be > 2 mg/L. and DO should not drop below 2 mg/L, and given the initial DO of 8.5 mg/L and a 2 mL sample is used in the test, what BOD range can the test cover? d) 850-990 mg/L a) 354-675 mg/L b) 220-855 mg/L c) 300-975 mg/L 3.2 You did hardness test by titrating EDTA solution with normality of 0.02 on a beaker containing a 100 ml. sample. The initial reading was 25 mL of EDTA. To reach the endpoint where the Erichrome Black-T changed its color from red to blue the final reading was 100 mL. The total hardness measured in mg/L as CaCO3 is: a) 155 b) 280 c) 650 d) 750 3.3 A 20°C sample is initially saturated with oxygen. Saturated seeded dilution water is used to obtain a 1:25 dilution. The final DO of the seeded dilution water is 8.2 mg/L while the final DO of the diluted sample is 2.8 mg/L. What is the 5-day BOD? a) 90 mg/L b) 152 mg/L c) 80 mg/L d) 136 mg/L 3.4 You did chloride test using precipitation titration with silver nitrate with molarity of 0.1 mole/L. You decided to use a sample size of 40 mL. You used 78 mL of this solution to reach the point where the color of the sample turns brackish or reddish brown. What is the concentration of CI in mg/L in the sample? a) 5250 mg/L b) 6501 mg/L c) 6914 mg/L d) 7405 mg/L 3.5 Results from jar test in lab to determine the best alum dose in a DWTP came in as in table below, the best dose is: Alum dose, mg/L 1 2 4 6 8 10 Turbidity, NTU 19.2 a) 2 mg/L b) 4 mg/L 12.6 c) 5 mg/L 10.5 8.6 8.2 7.4 d) 6 mg/L e) not in range
Transcribed Image Text:Clearly indicate your selection to answer the following questions. 3.1 You did a test using precipitation titration with silver nitrate. To prepare the solution you added 6.25 gram of AgNO, in 1000 ml. distilled water. What is the normality you prepared? a) 0.037 mole/L b) 0.025 mole/L c) 0.015 mole/L d) 0.011 mole/L 3.1 Using the two criteria for BOD test: depletion of oxygen should be > 2 mg/L. and DO should not drop below 2 mg/L, and given the initial DO of 8.5 mg/L and a 2 mL sample is used in the test, what BOD range can the test cover? d) 850-990 mg/L a) 354-675 mg/L b) 220-855 mg/L c) 300-975 mg/L 3.2 You did hardness test by titrating EDTA solution with normality of 0.02 on a beaker containing a 100 ml. sample. The initial reading was 25 mL of EDTA. To reach the endpoint where the Erichrome Black-T changed its color from red to blue the final reading was 100 mL. The total hardness measured in mg/L as CaCO3 is: a) 155 b) 280 c) 650 d) 750 3.3 A 20°C sample is initially saturated with oxygen. Saturated seeded dilution water is used to obtain a 1:25 dilution. The final DO of the seeded dilution water is 8.2 mg/L while the final DO of the diluted sample is 2.8 mg/L. What is the 5-day BOD? a) 90 mg/L b) 152 mg/L c) 80 mg/L d) 136 mg/L 3.4 You did chloride test using precipitation titration with silver nitrate with molarity of 0.1 mole/L. You decided to use a sample size of 40 mL. You used 78 mL of this solution to reach the point where the color of the sample turns brackish or reddish brown. What is the concentration of CI in mg/L in the sample? a) 5250 mg/L b) 6501 mg/L c) 6914 mg/L d) 7405 mg/L 3.5 Results from jar test in lab to determine the best alum dose in a DWTP came in as in table below, the best dose is: Alum dose, mg/L 1 2 4 6 8 10 Turbidity, NTU 19.2 a) 2 mg/L b) 4 mg/L 12.6 c) 5 mg/L 10.5 8.6 8.2 7.4 d) 6 mg/L e) not in range
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