CWEA Lab Analyst Grade 1/ Wastewater/Prac ce exam
With complete solu on Updated RATED New!!
2025/2026
Celcius - Ans (F-32)5/9
HPC media water bath - Ans 45`C, 3hr
Precision - Ans a measure of how close a series of measurements are to one another
Accuracy - Ans how close a measurement is to the true value
Electrical Fire - Ans unplug & sodium bicarbonate
analy)cal balance - Ans a device for determining mass that gives highly accurate measurements
top loading balance - Ans used to determine mass; not as precise as an analy)cal balance
triple beam balance - Ans instrument used to measure mass, less sensi)ve than top loading
Coliform - Ans Gram-nega)ve rod-shaped bacteria normally present in the intes)ne; includes E.
coli and other species.
temp and pH - Ans temp rises, pH drops. Must measure pH within 15 min of collec)ng sample
, Always add ___ to ___ - Ans acid to water
spectrometer - Ans a device that spreads light into its different colors
rounding off - Ans .5=keep # even <.4 stays the same >.6 round up
sig fig rules - Ans Non-zero digits are always significant.
Any zeros between two significant digits are significant.
A final zero or trailing zeros in the decimal por)on ONLY are significant.
adding sig figs - Ans smallest number of decimals
Alkalinity hold )me - Ans 14 days
COD hold )me - Ans 28 days
BOD hold )me - Ans 48 hours
pH hold )me - Ans 15 min
Turbidity hold )me - Ans 48 hours
BOD Temp Incubator - Ans 20+/- 1`C
Normality equa)on - Ans (N1)(V1)=(N2)(V2)
With complete solu on Updated RATED New!!
2025/2026
Celcius - Ans (F-32)5/9
HPC media water bath - Ans 45`C, 3hr
Precision - Ans a measure of how close a series of measurements are to one another
Accuracy - Ans how close a measurement is to the true value
Electrical Fire - Ans unplug & sodium bicarbonate
analy)cal balance - Ans a device for determining mass that gives highly accurate measurements
top loading balance - Ans used to determine mass; not as precise as an analy)cal balance
triple beam balance - Ans instrument used to measure mass, less sensi)ve than top loading
Coliform - Ans Gram-nega)ve rod-shaped bacteria normally present in the intes)ne; includes E.
coli and other species.
temp and pH - Ans temp rises, pH drops. Must measure pH within 15 min of collec)ng sample
, Always add ___ to ___ - Ans acid to water
spectrometer - Ans a device that spreads light into its different colors
rounding off - Ans .5=keep # even <.4 stays the same >.6 round up
sig fig rules - Ans Non-zero digits are always significant.
Any zeros between two significant digits are significant.
A final zero or trailing zeros in the decimal por)on ONLY are significant.
adding sig figs - Ans smallest number of decimals
Alkalinity hold )me - Ans 14 days
COD hold )me - Ans 28 days
BOD hold )me - Ans 48 hours
pH hold )me - Ans 15 min
Turbidity hold )me - Ans 48 hours
BOD Temp Incubator - Ans 20+/- 1`C
Normality equa)on - Ans (N1)(V1)=(N2)(V2)
