CWEA LABORATORY ANALYST CERTIFICATION EXAMINATION COMBINED TEST QUESTIONS WITH ACCURATE VERIFIED ANSWERS

CWEA LABORATORY ANALYST CERTIFICATION EXAMINATION COMBINED TEST QUESTIONS WITH ACCURATE VERIFIED 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 22 mLs sodium hydroxide. What is the normality of the sodium hydroxide? - ANSWER : 0.178 N