CWEA GRADE 1 LAB ANALYST EXAM ACTUAL EXAM 200 QUESTIONS AND CORRECT DETAILED ANSWERS WITH RATIONALES |AGRADE

CWEA GRADE 1 LAB ANALYST EXAM ACTUAL EXAM 200 QUESTIONS AND CORRECT DETAILED ANSWERS WITH RATIONALES |AGRADE
**Question 1: What is chloride and what effect can it have on
water?**
Answer: Chloride is a major anion found in many natural waters
and can impart a salty taste in H2O.
**Question 2: What increases the concentration of chloride in
wastewater?**
Answer: Chloride in human diet and softeners flushed into
sanitary sewer system.
**Question 3: What are the two most prevalent methods of
measuring chloride?**
Answer: Argentometric and mercuric nitrate.
**Question 4: How does the argentometric method measure
chloride?**
Answer: Titration of sample with standard solution of silver
nitrate (AgNO3); Indicator: Chromate ions (CrO4); End point:
reddish silver chromate.

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