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AWWA Lab Analyst 1 Questions and Answers 100% Solved
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Exam of 12 pages for the course AWWA at AWWA (AWWA Lab Analyst 1)
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AWWA Lab Analyst 1When determining the true color of a sample, the sample must first be treated to remove
turbidity? - answerThey must filter prior for true color.
Turbidity is measured using...? - answerNephelometric Turbidity Unit (NTU)
What are the reporting units for conductivity? - answeruS/cm or ohm/cm (there is a
conversion)
At a minimum, how many calibration standards should be used when analysis is
initiated? - answer3
What are significant figures? - answerEach of the digits of a number that are used to
express it to the required degree of accuracy, starting from the first nonzero digit.
How many significant digits are in the value 75.3? - answer3
How many significant digits are in the number 0.9000? - answer4
What is another name for soda ash? - answerSodium Carbonate
What is another name for caustic soda? - answersodium hydroxide
What are the quality control checks for an analytical run? - answer1. LCS, MB, DUP,
MS, MSD aka Positive, negative control, and duplicate
How should acids in glass containers be transported? - answerThey should be
transported in a rubber or plastic container.
What is total hardness? - answerMagnesium and Calcium
What is a grab sample? - answerA single sample at a single location
How should all chemicals be stored? - answerPer manufacturer
What type of balance is accurate? - answerAnalytical Balance
What is the meniscus? - answerCurved surface of liquid
If you combine 0.01mg of manganese into a 200mL sample, what is the concentration?
- answer1. Move decimal three places and divide by 200mL. 10mg/200mL= 0.05mg/L
, What happens to the pH value as the hydrogen ion increases? - answerTenfold (lower
pH) For every 1 point the pH changes by a factor of 10, so when pH drops the hydrogen
ions increase 10x.
What is the MPN method? - answer1. Most Probable Number. Method of estimating the
number of viable microorganisms in a product.
What is another name for sodium hydroxide? - answerCaustic soda
When performing a 2-point pH calibration, the standards chosen should ________ the
expected range of your sample. - answerBracket
What is used to sterilize broth for total coliform? - answerTemperature is used to
sterilize broth for the total coliform.
A linear calibration curve requires at least how many points? - answer3
Results of coliform membrane filter tests expressed? - answerColonies per 100mL
What does a spectrophotometer measure? - answerAbsorbance and wavelength
What titrant is used for alkalinity? - answerSulfuric acid (0.02N)
Coliform bacteria are used as? - answerIndicator
TSS Filter - answer2.0 micron fiber glass filter
When a membrane filter count shows 43 coliform colonies and 1.00mL of sample was
filtered, what is the correct number of coliform per 100mL? - answer4300
The titrant used in amperometric titration for chlorine residual is? - answerPhenylarsine
oxide
The most accurately measure 100mL of solution is? - answerVolumetric
What is the solids concentration of 8% sludge? - answer80,000
Potable water is the water which is usable for drinking and sanitary purposes. It has a
total dissolved solids content of around - answer150ppm
What is a burette used for? - answerTo dispense known amounts of liquids
The filter's pore size is measured in _______? - answerMicron
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