CWEA Grade I Laboratory Analyst Exam 2023 | Questions and Answers Latest Graded A+.

CWEA Grade I Laboratory Analyst Exam 2023 | Questions and Answers Latest Graded A+. Why does color change in water - Answer Presence of decaying vegetable matter, metal ions (ie. iron) or industrial and domestic pollution How is color measured - Answer Measured using visual comparison method Visual comparison method - Answer Sample compared to standards using matched nessler tubes - Standards prepared with solution containing cholorplatinate and cobaltous chloride Standard units for color - Answer One unit= color resulting from 1 mg of platinum/L 2 color reporting - Answer True and Apparent True color - Answer Color from dissolved substances, determine using sample treated to remove turbidity Apparent Color - Answer Includes dissolved and suspended solids Conductivity - Answer H2Os capability to pass electrical flow Conductivity of pure water - Answer 0 Units of conductivity - Answer micromhos/cm Temperature conductivity should be read at - Answer 25 degrees Celcius How is conductivity affected - Answer Mobility of ions, conductivity is dependent on viscosity Viscosity - Answer A liquids ability to resist flow, higher the viscosity the lower the flow Relationship of temperature and viscosity - Answer Inverse Acid - Answer A compound which liberates hydrogen ions and has a pH below 7. Alkalinity: - Answer The measurement of a sample's capacity to neutralize acid. Alkalinity measures - Answer The carbonate, bicarbonate, and hydroxide ion concentration found in water