LAB PROCEDURES THINGS YOU SHOULD AND SHOULDNT DO

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 about 1 cm from top filter paper. CCHS CHEMISTRY to of

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 SEE “Good Housekeeping” HANDOUT. Keeping your area clean is your responsibility. Always WASH HANDS before leaving lab. CCHS CHEMISTRY

ALWAYS BE SAFE!!! CCHS CHEMISTRY

CCHS CHEMISTRY