CWEA grade 1 lab analyst practice test part 2hb hb hb hb hb hb hb hb
1. What is chloride?: Major anion found in many natural waters - Can impart salty taste in H2O
hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb
2. What increases the concentration of chloride in wastewater?: Chloride in human
hb hb hb hb hb hb hb hb hb hb
diet and softeners flushed into sanitary sewer system
hb hb hb hb hb hb hb
3. 2 most prevalent methods of measuring chloride?: argentometric and mercuric nitrate
hb hb hb hb hb hb hb hb hb hb
4. What is the Argentometric method?: Titration of the sample with a standard solution of silver
hb hb hb hb hb hb hb hb hb hb hb hb hb hb
nitrate (AgNO3) - Indicator: Chromate ions (CrO4) - End point: reddish silver chromate
hb hb hb hb hb hb hb hb hb hb hb hb
5. What is the Mercuric Nitrate method?: Titration with standard mercuric nitrate solution -
hb hb hb hb hb hb hb hb hb hb hb hb
pH must be adjusted between 2.3 and 2.8 - Indicator: Diphenyl carbazone -
hb hb hb hb hb hb hb hb hb hb hb hb
End point: Change from blue to purple in the presence of mercury
hb hb hb hb hb hb hb hb hb hb hb hb
6. Which of the following can be an Interference of the Mercuric Nitrate M
hb hb hb hb hb hb hb hb hb hb hb hb
ethod?: Sulfide, bromide, orthophosphate (over 30 ppm), and iodide
hb hb hb hb hb hb hb hb
7. Why does the color change in water?
hb hb hb hb hb hb
a. Presence of decaying vegetable matter hb hb hb hb
b. metal ions (ie. iron) hb hb hb
c. industrial and domestic pollution hb hb hb
d. All of the above: d hb hb hb hb
8. How is color measured: Measured using visual comparison method
hb hb hb hb hb hb hb hb
9. What is the visual comparison method: Sample compared to standards using matching nessler
hb hb hb hb hb h b hb hb hb hb hb hb
tubes - Standards prepared with solution containing chloroplatinate and cobaltous chlorid
hb hb hb hb hb hb hb hb hb hb
10. What is the standard unit for color?: One unit= color resulting from 1 mg of platinum/L
hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb
11. What is 2-color reporting?: True and Apparent
hb hb hb hb hb hb
12. Define True color: Color from suspended solids, determine using sample treated to remove turbidity
hb hb hb hb hb hb hb hb hb hb hb hb hb
13. What is Apparent Color?: Color from both dissolved and suspended solids
hb hb hb hb hb hb hb hb hb hb
14. What is Conductivity?: H2O capability to pass electrical flow
hb hb hb hb hb hb hb hb
15. What is the conductivity of pure water?: 0 hb hb hb hb hb hb hb
16. What are the Units of conductivity?: µS/cm (micromhos/cm)
hb hb hb hb hb hb hb
17. What Temperature should conductivity be read at?: 25 degrees Celcius
hb hb hb hb hb hb hb hb hb
18. How is conductivity affected?: Mobility of ions, conductivity is dependent on viscosity
hb hb hb hb hb hb hb hb hb hb hb
19. What is Viscosity?: the resistance of a liquid to flow
hb hb hb hb hb hb hb hb hb
20. Describe the relationship of temperature and viscosity?: Inverse hb hb hb hb hb hb hb
21. What is an Acid?: A compound that liberates hydrogen ions and has a pH below 7.
hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb
22. What is Alkalinity?: The measurement of a sample's capacity to neutralize acid.
hb hb hb hb hb hb hb hb hb hb hb
1hb/hb
3
1. What is chloride?: Major anion found in many natural waters - Can impart salty taste in H2O
hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb
2. What increases the concentration of chloride in wastewater?: Chloride in human
hb hb hb hb hb hb hb hb hb hb
diet and softeners flushed into sanitary sewer system
hb hb hb hb hb hb hb
3. 2 most prevalent methods of measuring chloride?: argentometric and mercuric nitrate
hb hb hb hb hb hb hb hb hb hb
4. What is the Argentometric method?: Titration of the sample with a standard solution of silver
hb hb hb hb hb hb hb hb hb hb hb hb hb hb
nitrate (AgNO3) - Indicator: Chromate ions (CrO4) - End point: reddish silver chromate
hb hb hb hb hb hb hb hb hb hb hb hb
5. What is the Mercuric Nitrate method?: Titration with standard mercuric nitrate solution -
hb hb hb hb hb hb hb hb hb hb hb hb
pH must be adjusted between 2.3 and 2.8 - Indicator: Diphenyl carbazone -
hb hb hb hb hb hb hb hb hb hb hb hb
End point: Change from blue to purple in the presence of mercury
hb hb hb hb hb hb hb hb hb hb hb hb
6. Which of the following can be an Interference of the Mercuric Nitrate M
hb hb hb hb hb hb hb hb hb hb hb hb
ethod?: Sulfide, bromide, orthophosphate (over 30 ppm), and iodide
hb hb hb hb hb hb hb hb
7. Why does the color change in water?
hb hb hb hb hb hb
a. Presence of decaying vegetable matter hb hb hb hb
b. metal ions (ie. iron) hb hb hb
c. industrial and domestic pollution hb hb hb
d. All of the above: d hb hb hb hb
8. How is color measured: Measured using visual comparison method
hb hb hb hb hb hb hb hb
9. What is the visual comparison method: Sample compared to standards using matching nessler
hb hb hb hb hb h b hb hb hb hb hb hb
tubes - Standards prepared with solution containing chloroplatinate and cobaltous chlorid
hb hb hb hb hb hb hb hb hb hb
10. What is the standard unit for color?: One unit= color resulting from 1 mg of platinum/L
hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb
11. What is 2-color reporting?: True and Apparent
hb hb hb hb hb hb
12. Define True color: Color from suspended solids, determine using sample treated to remove turbidity
hb hb hb hb hb hb hb hb hb hb hb hb hb
13. What is Apparent Color?: Color from both dissolved and suspended solids
hb hb hb hb hb hb hb hb hb hb
14. What is Conductivity?: H2O capability to pass electrical flow
hb hb hb hb hb hb hb hb
15. What is the conductivity of pure water?: 0 hb hb hb hb hb hb hb
16. What are the Units of conductivity?: µS/cm (micromhos/cm)
hb hb hb hb hb hb hb
17. What Temperature should conductivity be read at?: 25 degrees Celcius
hb hb hb hb hb hb hb hb hb
18. How is conductivity affected?: Mobility of ions, conductivity is dependent on viscosity
hb hb hb hb hb hb hb hb hb hb hb
19. What is Viscosity?: the resistance of a liquid to flow
hb hb hb hb hb hb hb hb hb
20. Describe the relationship of temperature and viscosity?: Inverse hb hb hb hb hb hb hb
21. What is an Acid?: A compound that liberates hydrogen ions and has a pH below 7.
hb hb hb hb hb hb hb hb hb hb hb hb hb hb hb
22. What is Alkalinity?: The measurement of a sample's capacity to neutralize acid.
hb hb hb hb hb hb hb hb hb hb hb
1hb/hb
3
