1 / 32

LAB PROCEDURES

LAB PROCEDURES. THINGS YOU SHOULD AND SHOULDN’T DO IN LAB. 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.

kevinb
Télécharger la présentation

LAB PROCEDURES

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. LAB PROCEDURES THINGS YOU SHOULD AND SHOULDN’T DO IN LAB.

  2. 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.

  3. 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.

  4. LAB BOTTLES • Take SMALL AMOUNTS of chemicals - don’t waste.

  5. 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.

  6. 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.

  7. LEARN PROPER NAMES OF ALL APPARATUS.

  8. 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 aVARIETY OF BURNERS.

  9. 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.

  10. 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.

  11. MANIPULATION OF GLASS TUBING • HOT GLASS AND COLD GLASS LOOK THE SAME!!

  12. 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.

  13. 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.

  14. HEATING A TEST TUBE • Know the difference between BOIL and HEAT.

  15. POURING LIQUIDS • Hold at ARMS LENGTH. • Pour OVER SINK. • RINSE outside of bottle when finished. • Pouring from REAGENT BOTTLE, hold lip to lip.

  16. POURING LIQUIDS • Pouring from TEST TUBES, hold lip to lip. • Use a STIRRING ROD when pouring from a beaker.

  17. 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).

  18. USING A FUNNEL • Use funnelaire, filter rack, or iron ring to support funnel. • Make sure stem of funnel is touching side of beaker.

  19. USING A FUNNEL • Keep filter filled to about 1cm from top of filter paper.

  20. TRANSFERRING SOLIDS • If transferring a small amount, use a spatula. • Remember never dip into stock bottle.

  21. 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.

  22. DETECTING ODORS • Use a wafting motion to detect odors. • Never deeply inhale fumes. • Never put your face directly over chemicals to detect odors.

  23. 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.

  24. 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.

  25. DECANTING • Decanting - Pouring a liquid off of a settled solid. • Use a stirring rod. • Pour slowly.

  26. 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.

  27. 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.

  28. HEATING • CRUCIBLES, EVAPORATING DISHES, and any other porcelain or ceramic apparatus should be heated using a pipe-stem triangle as a support.

  29. HEATING • BEAKERS, FLASKS, and other glassware should be heated using a wire gauze as a support.

  30. CLEAN UP • SEE “Good Housekeeping” HANDOUT. • Keeping your area clean is your responsibility. • Always WASH HANDS before leaving lab.

  31. ALWAYS BE SAFE!!!

More Related