1. A laboratory needs glassware for prolonged heating and sterilization, but it may also encounter strong alkali. Which comparison between borosilicate and aluminosilicate glass is accurate?
2. A technician needs to deliver a measured fraction of a pipette’s capacity. Which pipette design is suited to this task?
3. A sample is viscous and difficult to pipette. Which micropipette mechanism is recommended for handling it?
What prolonged treatment can borosilicate glass tolerate?
Prolonged heating and sterilization.
How do volumetric transfer pipettes differ from graduated pipettes?
Transfer pipettes have one calibration mark; graduated pipettes have subdivisions for measuring and delivering fractions of their capacity.
How does an air-displacement micropipette separate its piston from the sample?
With an air cushion.
What samples are positive-displacement micropipettes recommended for?
Viscous, dense, or problematic samples.
Which reagents suit most analytical procedures, and which are used for maximum purity?
ACS analytical-grade reagents suit most procedures; ultrapure spectrograde or nanograde reagents minimize interference.
Which reagent water type is purest and used for high-accuracy standards?
Type I reagent water.
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