biochem lab equipment Flashcards
hold solids or liquids that will not release gases when reacted, or are unlikely to splatter if stirred or heated.
Very poor to measure volume with (+/-5%) accuracy
Note the size capacity (250 mL in this case)
Beakers
hold solids or liquids that may release gases during a reaction or that are likely to splatter if stirred or heated.
Erlenmeyer flasks
Rarely used in first year chemistry, it is used for the mixing of chemicals. Narrow neck prevents splash exposure.
Florence Flask
r is used to measure volumes of liquids – probably your best everyday measuring tool – there are three sizes in your desk.
Note the rubber “bumpers”, and also the size.
A graduated cylinder
are used to mix chemicals, and also to heat chemicals.
Test tubes
is useful for holding a test tube which is too hot to handle.
Knowing where to hold this piece of equipment is important.
A test tube holder
are for holding and organizing test tubes on the laboratory counter, and are found in the wall cabinets.
Test tube racks
are used to clean test tubes and graduated cylinders.
Forcing a large brush into a small test tube will often break the tube. Don’t worry about drying the inside of a test tube.
Test tube brushes
are used to close containers to avoid spillage or contamination.
Containers should never be heated when there is a stopper in place.
Rubber stoppers (also cork)
are used when we want to perform many small scale reactions at one time.
It is like having lots of test tubes available at one time.
Well plates
is used to hold a small amount of solid, such as the product of a reaction.
Can also be used as a cover for an evaporating dish or beaker.
A watch glass
is used to:
a) manually stir solutions;
b) assist in pouring liquids; and
c) to transfer a single drop of a solution.
Rubber policeman tip is used to remove precipitates.
The stirring rod
is used to transfer a small volume of liquid, usually one drop at a time.
On top of each dropper is a “rubber bulb” – never put your mouth on the dropper to provide suction
A dropper pipet
is used to identify bases:
Red turns blue,
Blue stays blue
Red litmus paper
is used to identify acids:
Blue turns red,
Red stays red
Blue litmus paper
are used to hold or pick up small objects.
Forceps
is used to aid in the transfer of liquids from one vessel to another, and will hold filter paper while filtering.
A funnel
measures and delivers exact volumes of liquids – uses a rubber bulb for suction.
A graduated pipet
are very accurate, highly dependable, and rugged.
The digital display makes the mass value very easy to determine.
Electronic balances
are used to dispense solid chemicals from their containers.
Chemicals should never be transferred with your bare hands.
Spatulas
are used to move beakers containing hot liquids.
Note the rubber coating to improve grip on the glass beaker - do not hold this in a burner flame.
Beaker tongs
are used for the heating of nonvolatile liquids and solids.
Hot plates will be used to gently heat any flammable chemicals.
Burners
is used for heating stable solid compounds and elements, as well as for evaporating nonvolatile solutions.
The evaporating dish
are used for heating certain solids, particularly metals, to very high temperatures. The cover can be used to contain any smoke particles.
Crucibles and cover
