CWEA GRADE 1 LAB ANALYST PRACTICE TEST
BANK EXAM ACTUAL EXAM 200 QUESTIONS
AND CORRECT DETAILED ANSWERS WITH
RATIONALES |AGRADE 2026-2027
Alkalinity Reporting
Alkalinity mg CaCO3/L
Alkalinity Measurement
The carbonate, bicarbonate, and hydroxide ion concentration found in water
Alkalinity Definition
The measurement of a sample's capacity to neutralize acid
Total Dissolved Solids Analysis Procedure
1. Stir sample with magnetic stirrer and pipet measured volume onto glass
fiber filter with applied vacuum. 2. Wash with 3 successive 10 ml volumes of
reagent grade water. 3. Suction for 3 minutes after filtration is complete. 4.
Transfer total filtrate to weighed evaporating dish and evaporate to dryness. 5.
Dry evaporated sample for 1 hour in 180
+/- 2 degree C. 6. Cool and weigh to constant weight.
,Total Solids Analysis Procedure
1. Choose sample volume that will yield residue between 2.5 and 200 mg. 2.
Dry evaporated sample for 1 hour in 103-105 degree C oven. 3. Cool in
desiccator and weigh to constant weight.
Total Suspended Solids Analysis Procedure
1. Wet filter to seat it. 2. Pipet measured volume to filter. 3. Wash filter with 3
successive 10 mL wash of reagent grade water and continue suction for 3
minutes. 4. Dry for 1 hour in 103-105 degree C oven.
Apparent Color
Includes dissolved and suspended solids
Argentometric
Titration of sample with standard solution of silver nitrate (AgNO3)
Indicator
Chromate ions (CrO4)
End point
reddish silver chromate
, pH
At a given temperature, the intensity of the acidic or basic character of a
solution is indicated by pH or hydrogen ion activity
Atomic Weight
The sum of the number of protons and the number of neutrons in the nucleus
of an atom. Atomic weights of elements are found on periodic tables.
Bacterial count per milliliter
CFU= colonies counted/ actual volume of sample plated, mL
Base
A compound which liberates hydroxide ions and has a pH above 7.
Bias
Consistent deviation of measured values from the true value, caused by
systematic errors in a procedure
Biochemical Oxygen Demand (BOD)
The quantity of oxygen utilized in the biochemical oxidation of organic
matter under standard laboratory procedures for five days at 20°
Centigrade, usually expressed as a concentration (e.g., mg/L). BOD
measurements are used to indicate the organic 'strength' of wastewater.
BANK EXAM ACTUAL EXAM 200 QUESTIONS
AND CORRECT DETAILED ANSWERS WITH
RATIONALES |AGRADE 2026-2027
Alkalinity Reporting
Alkalinity mg CaCO3/L
Alkalinity Measurement
The carbonate, bicarbonate, and hydroxide ion concentration found in water
Alkalinity Definition
The measurement of a sample's capacity to neutralize acid
Total Dissolved Solids Analysis Procedure
1. Stir sample with magnetic stirrer and pipet measured volume onto glass
fiber filter with applied vacuum. 2. Wash with 3 successive 10 ml volumes of
reagent grade water. 3. Suction for 3 minutes after filtration is complete. 4.
Transfer total filtrate to weighed evaporating dish and evaporate to dryness. 5.
Dry evaporated sample for 1 hour in 180
+/- 2 degree C. 6. Cool and weigh to constant weight.
,Total Solids Analysis Procedure
1. Choose sample volume that will yield residue between 2.5 and 200 mg. 2.
Dry evaporated sample for 1 hour in 103-105 degree C oven. 3. Cool in
desiccator and weigh to constant weight.
Total Suspended Solids Analysis Procedure
1. Wet filter to seat it. 2. Pipet measured volume to filter. 3. Wash filter with 3
successive 10 mL wash of reagent grade water and continue suction for 3
minutes. 4. Dry for 1 hour in 103-105 degree C oven.
Apparent Color
Includes dissolved and suspended solids
Argentometric
Titration of sample with standard solution of silver nitrate (AgNO3)
Indicator
Chromate ions (CrO4)
End point
reddish silver chromate
, pH
At a given temperature, the intensity of the acidic or basic character of a
solution is indicated by pH or hydrogen ion activity
Atomic Weight
The sum of the number of protons and the number of neutrons in the nucleus
of an atom. Atomic weights of elements are found on periodic tables.
Bacterial count per milliliter
CFU= colonies counted/ actual volume of sample plated, mL
Base
A compound which liberates hydroxide ions and has a pH above 7.
Bias
Consistent deviation of measured values from the true value, caused by
systematic errors in a procedure
Biochemical Oxygen Demand (BOD)
The quantity of oxygen utilized in the biochemical oxidation of organic
matter under standard laboratory procedures for five days at 20°
Centigrade, usually expressed as a concentration (e.g., mg/L). BOD
measurements are used to indicate the organic 'strength' of wastewater.
