NORTH CAROLINA WASTEWATER LAB
ANALYST CLASS 4 EXAM 2026 COMPLETE
STUDY GUIDE
◉ TC. Answer: In a 'TC' to contain marked pipette, the contained
quantity of the liquid corresponds to the capacity printed on the
pipette.
◉ Serological pipets. Answer: can be used to measure various
volumes from a single pipet due to their volume gradations. There
are two kinds of serological pipets,"blow out" and "drain out".
◉ Blow Out Pipet. Answer: Serological pipets from which the
volume in the tip should be "blown out" typically are graduated right
up to include the entire tip. These pipets are usually identified by the
presence of two thin colored or etched (frosted) rings at the top of
the pipet.
◉ Drain out pipet. Answer: which should be "drained out" typically
have their graduated markings stop prior to the tip. Volume should
not be drained below the last marking. These pipets are usually
identified by the presence of a color-coded rectangle or square (but
no frosted or colored rings) at the top of the pipet.
, ◉ The acidity of a sample is measured by..... Answer: the quantity of
weak acid required to bring the sample to a designated pH
◉ The standard titrant is__________ for acidity. Answer: 0.02N NaOH
◉ for Acidity samples can be held for how many days?. Answer: 14
days
◉ How is acidity reported. Answer: mg/L CaCO3 (calcium
carbonate)
◉ What are the pH endpoints for acidity. Answer: 3.7 (methyl
orange)
8.3 (phenolphthalein or total acidity)
◉ What is the formula for acidity. Answer: mg/L= (Titrant used,mL *
Normality of titrant * 50000)/ sample volume, mL
◉ What can cause acidity in wastewater. Answer: septic anaerobic
conditions in the collection system
◉ The acidity test measures...... Answer: mineral acidity of a sample
plus the acidity resulting from oxidation and hydrolysis of polyvalent
cations, including salts of iron and aluminum
ANALYST CLASS 4 EXAM 2026 COMPLETE
STUDY GUIDE
◉ TC. Answer: In a 'TC' to contain marked pipette, the contained
quantity of the liquid corresponds to the capacity printed on the
pipette.
◉ Serological pipets. Answer: can be used to measure various
volumes from a single pipet due to their volume gradations. There
are two kinds of serological pipets,"blow out" and "drain out".
◉ Blow Out Pipet. Answer: Serological pipets from which the
volume in the tip should be "blown out" typically are graduated right
up to include the entire tip. These pipets are usually identified by the
presence of two thin colored or etched (frosted) rings at the top of
the pipet.
◉ Drain out pipet. Answer: which should be "drained out" typically
have their graduated markings stop prior to the tip. Volume should
not be drained below the last marking. These pipets are usually
identified by the presence of a color-coded rectangle or square (but
no frosted or colored rings) at the top of the pipet.
, ◉ The acidity of a sample is measured by..... Answer: the quantity of
weak acid required to bring the sample to a designated pH
◉ The standard titrant is__________ for acidity. Answer: 0.02N NaOH
◉ for Acidity samples can be held for how many days?. Answer: 14
days
◉ How is acidity reported. Answer: mg/L CaCO3 (calcium
carbonate)
◉ What are the pH endpoints for acidity. Answer: 3.7 (methyl
orange)
8.3 (phenolphthalein or total acidity)
◉ What is the formula for acidity. Answer: mg/L= (Titrant used,mL *
Normality of titrant * 50000)/ sample volume, mL
◉ What can cause acidity in wastewater. Answer: septic anaerobic
conditions in the collection system
◉ The acidity test measures...... Answer: mineral acidity of a sample
plus the acidity resulting from oxidation and hydrolysis of polyvalent
cations, including salts of iron and aluminum
