CWEA LABORATORY ANALYST CERTIFICATION EXAM ALL GRADES 2024/2025 QUESTIONS AND CORRECT ANSWERS

CWEA LABORATORY ANALYST CERTIFICATION EXAM ALL GRADES 2024/2025 QUESTIONS AND CORRECT ANSWERS Celcius - Correct Answer (F-32)5/9 HPC media water bath - Correct Answer 45`C, 3hr Precision - Correct Answer a measure of how close a series of measurements are to one another Accuracy - Correct Answer how close a measurement is to the true value Electrical Fire - Correct Answer unplug & sodium bicarbonate analytical balance - Correct Answer a device for determining mass that gives highly accurate measurements top loading balance - Correct Answer used to determine mass; not as precise as an analytical balance triple beam balance - Correct Answer instrument used to measure mass, less sensitive than top loading Coliform - Correct Answer Gram-negative rod-shaped bacteria normally present in the intestine; includes E. coli and other species. temp and pH - Correct Answer temp rises, pH drops. Must measure pH within 15 min of collecting sample Always add ___ to ___ - Correct Answer acid to water spectrometer - Correct Answer a device that spreads light into its different colors rounding off - Correct Answer .5=keep # even <.4 stays the same >.6 round up sig fig rules - Correct Answer Non-zero digits are always significant. Any zeros between two significant digits are significant. A final zero or trailing zeros in the decimal portion ONLY are significant. adding sig figs - Correct Answer smallest number of decimals Alkalinity hold time - Correct Answer 14 days