What are the two principal means of dissolving inorganic materials?
By adding: (1) hydrochloric acid (2) nitric acid as a strong oxidizing acid
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15
What do you call this tool and what do you use it for?
Electronic analytical balance- precision measuring instrument to determine the mass of solid objects, liquids, powders and granular substances
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15
In a digestion process, is it advisable to add perchloric acid directly to organic or biological material? Why?
No. This is simply to prevent evaporation of the perchloric acid to near dryness, or a violent explosion may occur
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15
What is the purpose of syringe pipets?
Syringe pipets are useful for delivering microliter volumes.
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15
What do you call this tool and what do you use it for?
MEASURING PIPET - used for accurate measurements, especially for small volumes, if they are calibrated at the particular volume wanted
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15
In a folded filter paper for filtration, why do is there a need to tear about 1cm from the corner to the inside edge?
Because it will allow a good seal against the funnel to prevent air bubbles from being drawn in
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15
What do you call that process of converting nitrogen to ammonium sulfate?
Kjeldahl digestion or analysis
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15
How do microwaves heat?
Microwaves heat by causing molecules to rotate and ions to migrate.
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15
What is the difference between dry ashing and wet digestion?
dry ashing-heating at a high temperature in a muffle furnace, while wet digestion involves heating in the presence of a strong acid and an oxidizing agent
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15
What is an aliquot?
it is an analysis sample.
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15
What type of hood is often outfitted with high intensity UV lamps?
Biohazard hood
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15
How do you calibrate a pipet?
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15
What's the usual temperature of a drying oven in the laboratory?
The usual drying temperature is about 110âĶ C, but many laboratory ovens can be heated up to temperatures of 200 to 300âĶ C