CWEA grade 1 lab analyst part 2 Exam questions with accurate
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detailed answers ||
What is chloride? || ||
Major anion found in many natural waters - Can impart salty taste in H2O
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What increases the concentration of chloride in wastewater?
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Chloride in human diet and softeners flushed into sanitary sewer system
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2 most prevalent methods of measuring chloride?
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argentometric and mercuric nitrate || || ||
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What is the Argentometric method?
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Titration of the sample with a standard solution of silver nitrate (AgNO3) - Indicator: Chromate
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ions (CrO4) - End point: reddish silver chromate
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What is the Mercuric Nitrate method?
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Titration with standard mercuric nitrate solution -pH must be adjusted between 2.3 and 2.8 -
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Indicator: Diphenyl carbazone - End point: Change from blue to purple in the presence of
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mercury
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, Which of the following can be an Interference of the Mercuric Nitrate Method?
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Sulfide, bromide, orthophosphate (over 30 ppm), and iodide
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Why does the color change in water?
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a. Presence of decaying vegetable matter
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b. metal ions (ie. iron)
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c. industrial and domestic pollution
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d. All of the above
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d
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How is color measured || || ||
Measured using visual comparison method || || || ||
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What is the visual comparison method
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Sample compared to standards using matching nessler tubes - Standards prepared with solution
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containing chloroplatinate and cobaltous chlorid || || || ||
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What is the standard unit for color?
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One unit= color resulting from 1 mg of platinum/L
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detailed answers ||
What is chloride? || ||
Major anion found in many natural waters - Can impart salty taste in H2O
|| || || || || || || || || || || || ||
|| || ||
What increases the concentration of chloride in wastewater?
|| || || || || || ||
Chloride in human diet and softeners flushed into sanitary sewer system
|| || || || || || || || || ||
|| || ||
2 most prevalent methods of measuring chloride?
|| || || || || ||
argentometric and mercuric nitrate || || ||
|| || ||
What is the Argentometric method?
|| || || ||
Titration of the sample with a standard solution of silver nitrate (AgNO3) - Indicator: Chromate
|| || || || || || || || || || || || || || ||
ions (CrO4) - End point: reddish silver chromate
|| || || || || || ||
|| || ||
What is the Mercuric Nitrate method?
|| || || || ||
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 the presence of
|| || || || || || || || || || || || || || ||
mercury
|| || ||
, Which of the following can be an Interference of the Mercuric Nitrate Method?
|| || || || || || || || || || || ||
Sulfide, bromide, orthophosphate (over 30 ppm), and iodide
|| || || || || || ||
|| || ||
Why does the color change in water?
|| || || || || ||
a. Presence of decaying vegetable matter
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b. metal ions (ie. iron)
|| || || ||
c. industrial and domestic pollution
|| || || ||
d. All of the above
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d
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How is color measured || || ||
Measured using visual comparison method || || || ||
|| || ||
What is the visual comparison method
|| || || || ||
Sample compared to standards using matching nessler tubes - Standards prepared with solution
|| || || || || || || || || || || || ||
containing chloroplatinate and cobaltous chlorid || || || ||
|| || ||
What is the standard unit for color?
|| || || || || ||
One unit= color resulting from 1 mg of platinum/L
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