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Laboratory Tools

Study Slideshow

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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What do you call this tool and what do you use it for?

VOLUMETRIC FLASK - used for the dilution of solutions to a certain volume

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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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What do you call this tool and what do you use it for?

BURETS - used for the accurate delivery of a variable amount of solution. Its principal use is in titrations

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What do you call this tool and what is it for?

DESSICATORS - to keep samples dry while they are cooling and before they are weighed and, in some cases, to dry a wet sample

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What do you call this tool and what do you use it for?

FUME HOODS - used when chemicals or solutions are to be evaporated

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What type of hood is often outfitted with high intensity UV lamps?

Biohazard hood

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Why glass filters are not recommended for concentrated alkali solution?

because of high concentration the alkali will attack the glass filter and will destroy it

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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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What is grab sample?

It is one sample taken at random and assumed to be representative

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What is an aliquot?

it is an analysis sample.

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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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What do you call that process of converting nitrogen to ammonium sulfate?

Kjeldahl digestion or analysis

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How do microwaves heat?

Microwaves heat by causing molecules to rotate and ions to migrate.

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What is PFF?

Protein – Free Filtrate

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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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