) Exam Questions and Answers
Verified Solutions Latest Update
Question:
What increases concentration of chloride in wastewater
Answer:
Chloride in human diet and softeners flushed into sanitary sewer system
Question:
2 most prevalent methods of measuring chloride
Answer:
argentometric and mercuric nitrate
Question:
Argentometric
Answer:
Titration of sample with standard solution of silver nitrate (AgNO3) - Indicator:
Chromate ions (CrO4) - End point: reddish silver chromate
Question:
Mercuric Nitrate -✓✓Titration with standard mercuric nitrate
Answer:
pH must be adjusted between 2.3 and 2.8 - Indicator: Diphenyl carbazone-End point:
Change from blue to purple in presence of mercury
Question:
Interference of Mercuric Nitrate Method
Answer:
Sulfide, bromide, orthophosphate (over 30 ppm), and iodide
,Question:
Why does color change in water
Answer:
Presence of decaying vegetable matter, metal ions (ie. iron) or industrial and domestic
pollution
Question:
How is color measured
Answer:
Measured using visual comparison method
Question:
Visual comparison method
Answer:
Sample compared to standards using matched nessler tubes-Standards prepared with
solution containing cholorplatinate and cobaltous chloride
Question:
Standard units for color
Answer:
One unit= color resulting from 1 mg of platinum/L
Question:
2 color reporting
Answer:
True and Apparent
Question:
True color
Answer:
Color from dissolved substances, determine using sample treated to remove turbidity
,Question:
Apparent Color
Answer:
Includes dissolved and suspended solids
Question:
Conductivity
Answer:
H2Os capability to pass electrical flow
Question:
Conductivity of pure water
Answer:
0
Question:
Units of conductivity
Answer:
micromhos/cm
Question:
Temperature conductivity should be read at
Answer:
25 degrees Celcius
Question:
How is conductivity affected
Answer:
Mobility of ions, conductivity is dependent on viscosity
, Question:
Viscosity
Answer:
A liquids ability to resist flow, higher the viscosity the lower the flow
Question:
Relationship of temperature and viscosity
Answer:
Inverse
Question:
Acid
Answer:
A compound which liberates hydrogen ions and has a pH below 7.
Question:
Alkalinity
Answer:
The measurement of a sample's capacity to neutralize acid.
Question:
Alkalinity measures
Answer:
The carbonate, bicarbonate, and hydroxide ion concentration found in water
Question:
Primary reason for measuring alkalinity
Answer:
Used in control of many water and wastewater unit processes
Verified Solutions Latest Update
Question:
What increases concentration of chloride in wastewater
Answer:
Chloride in human diet and softeners flushed into sanitary sewer system
Question:
2 most prevalent methods of measuring chloride
Answer:
argentometric and mercuric nitrate
Question:
Argentometric
Answer:
Titration of sample with standard solution of silver nitrate (AgNO3) - Indicator:
Chromate ions (CrO4) - End point: reddish silver chromate
Question:
Mercuric Nitrate -✓✓Titration with standard mercuric nitrate
Answer:
pH must be adjusted between 2.3 and 2.8 - Indicator: Diphenyl carbazone-End point:
Change from blue to purple in presence of mercury
Question:
Interference of Mercuric Nitrate Method
Answer:
Sulfide, bromide, orthophosphate (over 30 ppm), and iodide
,Question:
Why does color change in water
Answer:
Presence of decaying vegetable matter, metal ions (ie. iron) or industrial and domestic
pollution
Question:
How is color measured
Answer:
Measured using visual comparison method
Question:
Visual comparison method
Answer:
Sample compared to standards using matched nessler tubes-Standards prepared with
solution containing cholorplatinate and cobaltous chloride
Question:
Standard units for color
Answer:
One unit= color resulting from 1 mg of platinum/L
Question:
2 color reporting
Answer:
True and Apparent
Question:
True color
Answer:
Color from dissolved substances, determine using sample treated to remove turbidity
,Question:
Apparent Color
Answer:
Includes dissolved and suspended solids
Question:
Conductivity
Answer:
H2Os capability to pass electrical flow
Question:
Conductivity of pure water
Answer:
0
Question:
Units of conductivity
Answer:
micromhos/cm
Question:
Temperature conductivity should be read at
Answer:
25 degrees Celcius
Question:
How is conductivity affected
Answer:
Mobility of ions, conductivity is dependent on viscosity
, Question:
Viscosity
Answer:
A liquids ability to resist flow, higher the viscosity the lower the flow
Question:
Relationship of temperature and viscosity
Answer:
Inverse
Question:
Acid
Answer:
A compound which liberates hydrogen ions and has a pH below 7.
Question:
Alkalinity
Answer:
The measurement of a sample's capacity to neutralize acid.
Question:
Alkalinity measures
Answer:
The carbonate, bicarbonate, and hydroxide ion concentration found in water
Question:
Primary reason for measuring alkalinity
Answer:
Used in control of many water and wastewater unit processes
