working with chemicals
DESCRIPTION
Working with Chemicals. Safely. Laboratory Equipment. Wire gauze. Bunsen burner. Ring stand. Ring. Test tubes. Beaker tongs. Crucible tongs. Forceps. Glass stirring rod. Test tube holder. Lab Equipment. Beaker. Erlenmeyer flask. Funnel. Scoopula. Spatula. 24-well plate. - PowerPoint PPT PresentationTRANSCRIPT
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Working with ChemicalsSafely
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Laboratory Equipment
Forceps
Test tube holder
Glass stirring rod
Beaker tongs
Crucible tongs
Test tubes
Wire gauze
Ring
Ring stand
Bunsen burner
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Lab Equipment
Beaker Erlenmeyer flask
Funnel
Scoopula Spatula 24-well plate
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Measuring LiquidsBeakers and
flasks are good for measuring approximate volumes of liquids but have a margin of error of ±5%
For more accurate measuring, use a graduated cylinder. ◦ Liquids form a
meniscus (curved surface) in graduated cylinders. Read the volume at the bottom of the meniscus.
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Reading a meniscusNever pick up the graduated
cylinder, leave it on the table and bend down to be at eye level with the liquid.
Read from the bottom of the meniscus!A.
B.
C.D.
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Transferring LiquidsTo prevent
splashing when pouring a liquid into an open container:◦ Place a stirring
rod in the container & pour the liquid down the rod
To pour into a small-mouthed container (like a test tube):◦ Pour the liquid
into a beaker 1st.◦ Then pour from
beaker into smaller container using the spout of the beaker
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Transferring SolidsTo a large-mouth
container: use a spoon, spatula, or a scoopula to collect & transfer the solid
To a small-mouth container: 1st crease a piece of paper in half, place the solid in the crease and pour into the container.
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More safe proceduresNever use a thermometer to stir
a solution! You could break the thermometer.
Always wear goggles over your eyes!
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More safety proceduresNo playing in the lab!
No eating or drinking in the lab!
Follow directions and pay attention!