LAB PROCEDURES
THINGS YOU SHOULD AND
SHOULDN’T DO IN LAB.
CCHS CHEMISTRY
LAB BOTTLES
 RETURN
stock bottles to side shelf
as quickly as possible.
- Do not dispense chemicals at
the side shelf .
 Replace CAP immediately and
securely.
- do not leave caps on table or
put on different bottle.
CCHS CHEMISTRY
LAB BOTTLES
 Never
dip SPATULA or PIPETTE
into stock bottle.
 Never return EXCESS MATERIAL
to stock bottle.
 Use a ROLLING MOTION to get a
small amount of solid from a stock
bottle.
CCHS CHEMISTRY
LAB BOTTLES
 Take
SMALL AMOUNTS of
chemicals - don’t waste.
CCHS CHEMISTRY
DISPOSAL OF WASTE
 SOLUBLE,
HARMLESS substs. - wash
down the drain with lots of water.
 ACIDS - neutralize in washing soda
soln. and put down drain.
 HARMFUL CHEMICALS - put in
special, marked containers provided.
CCHS CHEMISTRY
DISPOSAL OF WASTE
 BROKEN
GLASS and HARMLESS
INSOLUBLE SOLIDS - in waste
bucket - no paper.
 PAPER - in proper trash can - NO
GLASS in trash can.
 MATCHES - in soda (pop) cans.
CCHS CHEMISTRY
LEARN PROPER
NAMES OF ALL
APPARATUS.
CCHS CHEMISTRY
BUNSEN BURNERS
Learn to LIGHT AND ADJUST different
burners properly.
- Blue flame with 2 cones.
- 5 - 8 cm, little or no roaring.
 Use FISHER BURNERS only where
high temp. is needed.
 Become familiar with a VARIETY OF
BURNERS.

CCHS CHEMISTRY
MANIPULATION OF GLASS
TUBING
A. Cutting
• Make 1 scratch with a triangular file.
• Protect your hands with paper towel.
• Point scratch away from yourself and
others.
• Pull ends toward you in a quick
snapping motion.
• Fire polish both ends.
CCHS CHEMISTRY
MANIPULATION OF GLASS
TUBING
B. BENDING
• Use wing tip (flame spreader).
• Heat evenly entire area to be
bent.
• Remove from flame and bend
slowly.
• Place hot glass on ceramic tile.
CCHS CHEMISTRY
MANIPULATION OF GLASS
TUBING
 HOT
GLASS AND COLD
GLASS LOOK THE SAME!!
CCHS CHEMISTRY
HEATING A TEST TUBE
 HOLD
near the top with a test tube
holder.
 Don’t allow the FLAME to touch the
holder.
 FILL test tube less than half full.
CCHS CHEMISTRY
HEATING A TEST TUBE
 SLANT
test tube.
 POINT test tube away from others.
 MOVE test tube in flame - Constant
Motion.
 Heat BELOW the surface of the
liquid.
CCHS CHEMISTRY
HEATING A TEST TUBE
 Know
the difference between BOIL
and HEAT.
CCHS CHEMISTRY
POURING LIQUIDS
 Hold
at ARMS LENGTH.
 Pour OVER SINK.
 RINSE outside of bottle when
finished.
 Pouring from REAGENT BOTTLE,
hold lip to lip.
CCHS CHEMISTRY
POURING LIQUIDS
 Pouring
from TEST TUBES, hold lip
to lip.
 Use a STIRRING ROD when
pouring from a beaker.
CCHS CHEMISTRY
USING FILTER PAPER
WITH FUNNEL
 Fold
paper in fourths.
 Open so paper resembles a cone.
 Place paper in funnel so that 1 cm
of funnel is exposed.
 Wet paper with solvent (usually
water).
CCHS CHEMISTRY
USING A FUNNEL
 Use
funnelaire, filter
rack, or iron ring to
support funnel.
 Make sure stem of
funnel is touching side
of beaker.
CCHS CHEMISTRY
USING A FUNNEL
 Keep
filter filled to
about 1cm from top of
filter paper.
CCHS CHEMISTRY
TRANSFERRING SOLIDS
 If
transferring a small amount,
use a spatula.
• Remember never dip into
stock bottle.
CCHS CHEMISTRY
TRANSFERRING SOLIDS
 If
transferring larger amounts
use a small piece of paper.
• Put solid on paper.
• Roll paper or fold in half to
pour solid.
CCHS CHEMISTRY
DETECTING ODORS
 Use
a wafting motion to detect
odors.
 Never deeply inhale fumes.
 Never put your face directly
over chemicals to detect odors.
CCHS CHEMISTRY
INSERTING GLASS TUBING
INTO RUBBER STOPPER
 Find
stopper with proper size
hole.
• Should fit snugly.
 Lubricate tubing and stopper
with glycerin or water.
• Don’t use too much.
CCHS CHEMISTRY
INSERTING GLASS TUBING
INTO RUBBER STOPPER
 Insert
with twisting motion.
• Don’t push too hard.
 End of tubing should be below the
level of the liquid.
CCHS CHEMISTRY
DECANTING
 Decanting
- Pouring a liquid off
of a settled solid.
 Use a stirring rod.
 Pour slowly.
CCHS CHEMISTRY
USING TEST PAPERS
 Never
dip test papers into
liquid.
 Place test paper on glass
square.
 Using a clean stirring rod, place
a drop of liquid to be tested on
paper.
CCHS CHEMISTRY
USING TEST PAPERS
 Litmus
paper is used to test for
acid or base.
 Cobalt chloride paper is used to
test for the presence of water.
• Must be dry (blue) before use.
CCHS CHEMISTRY
HEATING
 CRUCIBLES,
EVAPORATING
DISHES, and any other
porcelain or ceramic apparatus
should be heated using a pipestem triangle as a support.
CCHS CHEMISTRY
HEATING
 BEAKERS,
FLASKS, and other
glassware should be heated
using a wire gauze as a
support.
CCHS CHEMISTRY
CLEAN UP
“Good Housekeeping”
HANDOUT.
 Keeping your area clean is your
responsibility.
 Always WASH HANDS before
leaving lab.
 SEE
CCHS CHEMISTRY
ALWAYS BE SAFE!!!
CCHS CHEMISTRY
CCHS CHEMISTRY