Lab Tools and Instruments Flashcards
Beaker
- glass cup with a spout at the top
- lines on the sides are most likely in ml
- inaccurate
Erlenmeyer Flask
- looks like a beaker but is narrower at the top
- measurements approximated to the nearest millimeter
- easy to place stoppers
Volumetric Flasks
- rounded at the bottom
- long skinny neck
- used for medium level precision
- only one mark for a specific volume
Stoppers
-rubber tops that fit on the top of flasks or test tubes
Test Tubes
-a rounded glass tube
Test Tube Brushes
-cleans test tubes
Funnels
- cone-shaped
- has a stem
- transfers solutions/liquids between separate containers
Filter Paper
- used for filtering out solids/precipitates
- must be folded properly
- very thin
Graduated Cylinders
- fairly accurate to 0.1
- measures liquids
- reads from the bottom of the meniscus
Pipettes
- long thin tube with suction attached
- draws up correct amount of liquid
Burette and Stand
- long thin pipe with a valve and stopcock
- held by a ring stand
- precise calculations, accurate to 0.01
Bunsen Burners
- used to heat things
- open flame fed by a gas line
- controlled by turning a valve
Ring Stands
- circle of metal attached to a stand that can hold breakers or flasks
- beakers and flasks are supported by wire gauze/clay triangle
Hot Plates
- heats things
- no open flame
- controlled by a dial
Electronic Balances
-measures the mass of a substance
Double Pan Balances
- compares the weight of two different objects
- you must know at least one mass of the two substances
Weighing Boats/Papers
- used to hold the substance being weighed
- subtract the mass of the boat first
Spatulas/Scoopulas
- metal or plastic
- transfer solid substances from one container to another
Mortar and Pestle
- grinds larger pieces into powder
- mortar is a bowl
- pestle is the grinding tool
Thermometers
-measures temperature
A beaker is used to…
mix, heat, or hold substances
Burettes are often used for _____
titrations (with an Erlenmeyer flask)
Meniscus
The concave curve at a liquid’s surface (you measure from here while using a graduated cylinder).
A meniscus is created because….
the liquid’s particles are attracted to the walls of a container.
Test tubes are usually held upright using….
clamps or test tube holders
Triple Beam Balance
-measures the mass of an object based on a comparison to predetermined masses (predetermined masses are called riders)
Analytical Balance
- single pan
- measures with great accuracy and precision
Manometer
- measures the pressure of a fluid
- measures pressure based on differences in the height and position of a column of liquid in a “U” shaped tube.
Manometers often measure pressure close to _____ pressure
atmospheric
What is Po and Pa in reference to a manometer?
Po= reference pressure (open to atmosphere)
Pa=testing pressure
Barometer
- a type of manometer used to measure atmospheric pressure
- when water/mercury rises, the pressure is increasing
- when water/mercury falls, the pressure is decreasing
- commonly used in weather reporting
