CWE I Laboratory Analyst with complete solution

CWE I Laboratory Analyst with complete solution
Question : What is chloride?
Correct answer: Major anion found in many natural waters -
Can impart salty taste in H2O
Question : What increases the concentration of chloride in
wastewater?
Correct answer: Chloride in human diet and softeners flushed
into sanitary sewer system
Question : 2 most prevalent methods of measuring chloride?
Correct answer: argentometric and mercuric nitrate
Question : What is the Argentometric method?
Correct answer: Titration of the sample with a standard
solution of silver nitrate (AgNO3) - Indicator: Chromate ions
(CrO4) - End point: reddish silver chromate
Question : What is the Mercuric Nitrate method?
Correct 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 the presence of mercury

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