CWEA LABORATORY ANALYST EXAM ALL GRADES 2025/2026 BANK | ACCURATE REAL
EXAM VERSIONS | CURRENTLY TESTING WITH A STUDY GUIDE AND KNOWLEDGE CHECK
FLASHCARDS | GUARANTEED PASS /BRAND NEW!!
Chloride - (answer)- Major anion found in many natural waters
- Can impart salty taste in H2O
What increases concentration of chloride in wastewater - (answer)Chloride in human diet and softeners
flushed into sanitary sewer system
2 most prevalent methods of measuring chloride - (answer)argentometric and mercuric nitrate
Argentometric - (answer)Titration of sample with standard solution of silver nitrate (AgNO3)
- Indicator: Chromate ions (CrO4)
- End point: reddish silver chromate
Mercuric Nitrate - (answer)Titration with standard mercuric nitrate solution
-pH must be adjusted between 2.3 and 2.8
- Indicator: Diphenyl carbazone
- End point: Change from blue to purple in presence of mercury
Interference of Mercuric Nitrate Method - (answer)Sulfide, bromide, orthophosphate (over 30 ppm),
and iodide
Why does color change in water - (answer)Presence of decaying vegetable matter, metal ions (ie. iron)
or industrial and domestic pollution
How is color measured - (answer)Measured using visual comparison method
,CWEA LABORATORY ANALYST EXAM ALL GRADES 2025/2026 BANK | ACCURATE REAL
EXAM VERSIONS | CURRENTLY TESTING WITH A STUDY GUIDE AND KNOWLEDGE CHECK
FLASHCARDS | GUARANTEED PASS /BRAND NEW!!
Visual comparison method - (answer)Sample compared to standards using matched nessler tubes
- Standards prepared with solution containing cholorplatinate and cobaltous chloride
Standard units for color - (answer)One unit= color resulting from 1 mg of platinum/L
2 color reporting - (answer)True and Apparent
True color - (answer)Color from dissolved substances, determine using sample treated to remove
turbidity
Apparent Color - (answer)Includes dissolved and suspended solids
Conductivity - (answer)H2Os capability to pass electrical flow
Conductivity of pure water - (answer)0
Units of conductivity - (answer)micromhos/cm
Temperature conductivity should be read at - (answer)25 degrees Celcius
How is conductivity affected - (answer)Mobility of ions, conductivity is dependent on viscosity
Viscosity - (answer)A liquids ability to resist flow, higher the viscosity the lower the flow
, CWEA LABORATORY ANALYST EXAM ALL GRADES 2025/2026 BANK | ACCURATE REAL
EXAM VERSIONS | CURRENTLY TESTING WITH A STUDY GUIDE AND KNOWLEDGE CHECK
FLASHCARDS | GUARANTEED PASS /BRAND NEW!!
Relationship of temperature and viscosity - (answer)Inverse
Acid - (answer)A compound which liberates hydrogen ions and has a pH below 7.
Alkalinity: - (answer)The measurement of a sample's capacity to neutralize acid.
Alkalinity measures - (answer)The carbonate, bicarbonate, and hydroxide ion concentration found in
water
Primary reason for measuring alkalinity - (answer)Used in control of many water and wastewater unit
processes
How is alkalinity measured - (answer)Titration of a sample with a standard solution of either sulfuric acid
or hydrochloric acid to predetermined pH endpoint
The phenolphthalein alkalinity of a water sample is zero if: - (answer)The pH is greater than 8.3
Atomic Weight: - (answer)The sum of the number of protons and the number of neutrons in the nucleus
of an atom.
Atomic weights of elements are found on periodic tables.
Base: - (answer)A compound which liberates hydroxide ions and has a pH above 7.
EXAM VERSIONS | CURRENTLY TESTING WITH A STUDY GUIDE AND KNOWLEDGE CHECK
FLASHCARDS | GUARANTEED PASS /BRAND NEW!!
Chloride - (answer)- Major anion found in many natural waters
- Can impart salty taste in H2O
What increases concentration of chloride in wastewater - (answer)Chloride in human diet and softeners
flushed into sanitary sewer system
2 most prevalent methods of measuring chloride - (answer)argentometric and mercuric nitrate
Argentometric - (answer)Titration of sample with standard solution of silver nitrate (AgNO3)
- Indicator: Chromate ions (CrO4)
- End point: reddish silver chromate
Mercuric Nitrate - (answer)Titration with standard mercuric nitrate solution
-pH must be adjusted between 2.3 and 2.8
- Indicator: Diphenyl carbazone
- End point: Change from blue to purple in presence of mercury
Interference of Mercuric Nitrate Method - (answer)Sulfide, bromide, orthophosphate (over 30 ppm),
and iodide
Why does color change in water - (answer)Presence of decaying vegetable matter, metal ions (ie. iron)
or industrial and domestic pollution
How is color measured - (answer)Measured using visual comparison method
,CWEA LABORATORY ANALYST EXAM ALL GRADES 2025/2026 BANK | ACCURATE REAL
EXAM VERSIONS | CURRENTLY TESTING WITH A STUDY GUIDE AND KNOWLEDGE CHECK
FLASHCARDS | GUARANTEED PASS /BRAND NEW!!
Visual comparison method - (answer)Sample compared to standards using matched nessler tubes
- Standards prepared with solution containing cholorplatinate and cobaltous chloride
Standard units for color - (answer)One unit= color resulting from 1 mg of platinum/L
2 color reporting - (answer)True and Apparent
True color - (answer)Color from dissolved substances, determine using sample treated to remove
turbidity
Apparent Color - (answer)Includes dissolved and suspended solids
Conductivity - (answer)H2Os capability to pass electrical flow
Conductivity of pure water - (answer)0
Units of conductivity - (answer)micromhos/cm
Temperature conductivity should be read at - (answer)25 degrees Celcius
How is conductivity affected - (answer)Mobility of ions, conductivity is dependent on viscosity
Viscosity - (answer)A liquids ability to resist flow, higher the viscosity the lower the flow
, CWEA LABORATORY ANALYST EXAM ALL GRADES 2025/2026 BANK | ACCURATE REAL
EXAM VERSIONS | CURRENTLY TESTING WITH A STUDY GUIDE AND KNOWLEDGE CHECK
FLASHCARDS | GUARANTEED PASS /BRAND NEW!!
Relationship of temperature and viscosity - (answer)Inverse
Acid - (answer)A compound which liberates hydrogen ions and has a pH below 7.
Alkalinity: - (answer)The measurement of a sample's capacity to neutralize acid.
Alkalinity measures - (answer)The carbonate, bicarbonate, and hydroxide ion concentration found in
water
Primary reason for measuring alkalinity - (answer)Used in control of many water and wastewater unit
processes
How is alkalinity measured - (answer)Titration of a sample with a standard solution of either sulfuric acid
or hydrochloric acid to predetermined pH endpoint
The phenolphthalein alkalinity of a water sample is zero if: - (answer)The pH is greater than 8.3
Atomic Weight: - (answer)The sum of the number of protons and the number of neutrons in the nucleus
of an atom.
Atomic weights of elements are found on periodic tables.
Base: - (answer)A compound which liberates hydroxide ions and has a pH above 7.
