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Laboratory Procedures. Fume Hood. Located between lab and prep room Prevents harmful fumes from entering lab May be used for demonstrations Often used by teacher when diluting or disposing of chemicals Open to outside at all times, fan can be turned on for more airflow. Spill Control. - PowerPoint PPT Presentation
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Chemistry 1
Laboratory Procedures
Chemistry 2
Fume Hood Located between lab and prep
room Prevents harmful fumes from
entering lab May be used for demonstrations Often used by teacher when
diluting or disposing of chemicals Open to outside at all times, fan
can be turned on for more airflow
Chemistry 3
Spill Control If you spill on yourself, rinse with
water immediately! If you spill on the lab bench or the
floor, dilute with water if practical before cleaning up.
Then use one of the following spill control products, all located under the goggle cabinet
Chemistry 4
Spill Control Spill control pillows:
Use for any spill Place pillow on spill and wipe as
needed Sand
Use for any spill Mainly for containment – keeps spill
from spreading
Chemistry 5
Spill Control Absorbent material
Use for any spill Very absorbent Especially useful for flammable liquids
Ethanol, acetone, etc. Acid neutralizer
Use for acid spills It may foam
Chemistry 6
Safety Shower Located next to fume hood Used for chemical spills over large
areas of the body. To use:
Stand under shower Remove effected clothing Pull down on handle Push up on bar to shut off
Chemistry 7
Eye Wash Station Located under safety shower Used for chemicals splashed in
eyes To use:
Push lever to turn on Put eyes in path of spray Hold eyes open Remove contact lenses Stay for 10 minutes
Chemistry 8
Fire extinguishers Located by lab door Pull hard on door to open To use, remember PASS
Pull pin out Aim at base of fire Squeeze trigger Sweep from side to side
Chemistry 9
Fire blanket Located near fire extinguisher Use to cover a person who is on
fire If you are on fire,
Stop, drop, and roll Someone will get the fire blanket and
help you
Chemistry 10
Fire alarm Located in hallway Use if there is a large or
uncontrolled fire Pull alarm and exit the building
Chemistry 11
Gas Shut Off Located near prep room Used to turn off gas to entire lab Turn handle so it is perpendicular
to pipe to shut gas off
Chemistry 12
Lab attire Goggles and aprons are designed
to protect you from chemical spills – wear them
Take care to keep your hair and clothing away from chemicals and bunsen burners
Be careful with open-toed shoes and shorts or short skirts
Chemistry 13
Use common sense When in lab, pay attention to what
you are doing Watch where you are going Don’t push, shove, pinch, startle,
or sneak up on anyone Don’t crowd around chemical or
weighing stations – everyone will get a turn
Chemistry 14
Test tubes Available in many sizes Used for many tasks, including
mixing and heating of substances
Chemistry 15
Test tube brush Used to clean test tubes Different sizes are available – ask if
you need a different one
Chemistry 16
Test tube holder Used to hold test tubes in your
hand while heating them
Chemistry 17
Utility clamp Used to hold test tubes or flasks
attached to a ring stand
Chemistry 18
Test tube rack Sets on table Used to hold test tubes during an
experiment
Chemistry 19
Ring stands and rings Variety of uses Often used to support test tubes,
beakers, or flasks being heated by a bunsen burner
Chemistry 20
Graduated cylinders Available in different sizes Use the smallest one that will meet
your needs for the best accuracy If measuring a large amount you
may need to refill as you measure
Chemistry 21
Beakers Used to hold chemicals May be used for mixing or heating Only used to measure
approximate volumes
Chemistry 22
Erlenmeyer flasks Used to hold, mix, and heat
chemicals To mix, hold by the neck and swirl
Chemistry 23
Florence flasks Used to hold, mix, and heat
chemicals To mix, hold by the neck and swirl
Chemistry 24
Beaker tongs Used to move hot beakers
Chemistry 25
Forceps tweezers
Chemistry 26
Squares Wire mesh and ceramic Used to support beakers and flasks
being heated with a bunsen burner
Chemistry 27
Scoopula Used to scoop dry materials out of
their bottles
Chemistry 28
Evaporating dish Used for heating
Chemistry 29
Watch glasses Curved circular pieces of glass Often used to cover evaporating
dishes while heating
Chemistry 30
Collecting bottles Variety of uses Often used to collect displaced
gases
Chemistry 31
Crucible Used for heating Has a lid
Chemistry 32
Clay triangle Used to support crucibles being
heated by a Bunsen burner
Chemistry 33
Crucible tongs Used to move hot crucibles or
crucible lids
Chemistry 34
Pneumatic trough Used to hold large quantities of
liquids (usually water) Has an overflow prevention spout:
make sure this is over the sink
Chemistry 35
Wash bottle Squeeze bottle Often used for cleaning Never touch the tip of a wash
bottle to anything. After you stop squeezing, the bottle
sucks in air. If there is a chemical on the tip of the
bottle, it will suck that in too.
Chemistry 36
Hot glassware Looks the same as cool glassware If you drop hot glassware, don’t
catch it with your hands!! I would rather clean up broken glass
than treat you for burns
Chemistry 37
Broken glassware Sweep the pieces up with the
broom Put them in the glass disposal box
Chemistry 38
Measuring solids Use a balance Place your weighing paper or other
container on the balance. Push the ZERO button. Make sure the balance reads zero
before you start putting the material on it.
Chemistry 39
Measuring solids Add a little at a time so you don’t
go over the needed amount. If you get too much, don’t put it
back in the bottle. Give it to someone else who needs it Or put it in the trash or waste beaker
Chemistry 40
Measuring liquids Unless the directions say
approximately, measure with a graduated cylinder.
Use the smallest graduated cylinder that will get the job done – this will be the most accurate.
Chemistry 41
Measuring liquids Read the graduated cylinder at eye
level. Don’t hold it up to your eyes. Bring your eyes down to its level by
squatting or bending over.
Chemistry 42
Measuring liquids Pour slowly so you don’t get too
much Be extra careful if you are using a
funnel If you get too much, don’t pour it
back in the bottle. Give it to someone else who needs it Or pour it down the drain with lots of
water Or put it in the waste beaker
Chemistry 43
The meniscus Measure to
the bottom of the meniscus
Chemistry 44
Using droppers Like wash bottles, make sure the
dropper tip doesn’t touch anything. After you stop squeezing, the dropper
sucks in air. If there is a chemical on the tip of the
dropper, it will suck that in too.
Chemistry 45
Cleaning labware Squeeze in some soap (only if really
dirty) Use a test tube brush if needed Ask for another brush if needed Rinse at least three times with tap
water (or until all soap is gone) Rinse once with distilled water Put on drying rack or in other
designated location.