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CWEA - Lab Analyst III Exam 2025 Questions and Answers What does COLOR measure? - --Answer --Amount of color units (CU) in a sample. Color caused by natural metallic ions (Fe & Mg) & industrial wastes. What is the test summary for COLOR? - --Answer --Sample -> Tubes -> Compare to color standards over light source Which of the following techniques is used to isolate anionic surfactants (as MBAS) from the sample matrix? - --Answer --Extraction In the cyanide determination, which one of the following is not an interference? - -Answer --Halogenated aromatics Which of the following is not a major interference in phenol determination? - -Answer --Hydroxy derivatives of benzene A freshly prepared sodium hydroxide (NaOH) solution is standardized against primary standard potassium acid phthalate (KHC8H4O4). 0.8000 grams of potassium acid phthalate was dissolved into 50 mL CO2-free water. 2-3 drops of phenolphthalein were added. The sample was titrated to a faint pink endpoint with ....COPYRIGHT ©️ 2025 ALL RIGHTS RESERVED...TRUSTED & 1