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Lab Safety

Lab Safety. General Safety Procedures. Follow all instructions carefully Do only experiments assigned by the teacher. Never use chemicals in an unauthorized manor. Never work alone in the laboratory, and never work without the teacher’s supervision.

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Lab Safety

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  1. Lab Safety

  2. General Safety Procedures • Follow all instructions carefully • Do only experiments assigned by the teacher. Never use chemicals in an unauthorized manor. • Never work alone in the laboratory, and never work without the teacher’s supervision. • Never eat, drink, chew gum or apply cosmetics in the laboratory. Do not store food in the lab area.

  3. General Safety Procedures • Approach laboratory work with maturity. Never act out in the lab. • Keep your work area clean and uncluttered. Store books on the desks in the middle of the room and never on the lab benches. • Dispose of used chemicals and their solutions only as directed by the teacher. • Turn off all electrical equipment, water and gas when not in use, especially at the end of the lab period.

  4. General Safety Procedures • Know the location and how to operate all safety equipment in the classroom, including fire extinguisher, fire blankets, sand, safety showers, eyewash fountains, and first aid kit. • The sink is not a garbage can. Do not use the sink to discard matches, filter paper, or other solid or slightly soluble materials.

  5. Laboratory Apparel Precautions • Do not wear loose fitting sleeves, bulky outerwear, clothes that bare the midriff, or open toe shoes. Make sure that legs are covered completely. • Tie back long hair. • Wear safety goggles when using chemicals, hot liquids, lab burners or hot plates. • Wear nitrile gloves when working with poisonous, corrosive, or irritating chemicals.

  6. Accident Procedures • Report all accidents or injuries and all breakage or spills to the teacher immediately, no matter how minor. • If a chemical spills on your skin, wash it off immediately for a minimum of 15 minutes with plenty of cool water and notify the teacher. • If a chemical gets into your eyes, wash immediately at the eyewash fountain with plenty of water. Wash for a minimum of 15 minutes and notify the teacher. • If a chemical spills on your clothing, remove the contaminated clothing and flush the affected area of skin immediately for a minimum of 15 minutes with plenty of cool water and notify the teacher.

  7. Accident Procedures Broken glass: • Notify the teacher • Keep others away from the area • Use a dustpan and a brush to clean up broken glass • Dispose of the broken glass in the broken glass bin • Wipe the area with a wet paper towel to pick up any remaining shards of glass. Chemical Spill (of an aqueous solution): • Notify the teacher • Test solution using pH paper to determine of A,B,N • If the solution is acid or base, neutralize first (sodium bicarbonate powder works for either an acid or base solution) • Soak up the slurry with plenty of paper towel • Rinse off paper towel with water in a nearby sink and wring out • Dispose of paper towel in the garbage

  8. Accident Procedures Smelling a solution in the lab: • Never smell anything in the lab, unless specifically directed to do so by a teacher. • Use the wafting procedure for smelling chemicals. *Put the solution about 30. cm away in front of your nose and gently fan your hand over the top of the container to direct the vapor towards your nose. Inhale lightly, to get a faint trace of the odor. • NEVER put your face directly over the chemical and inhale.

  9. Lab Tour Can you find the following safety equipment? • Fire Blanket • Fire Extinguisher • Broken Glass Container • Broom and Dustpan • Shower • Eye Wash Station • First Aid Kit • Goggles • Lab Coats • Gloves • Sand • MSDS binders • Sinks • Fume hood

  10. Fire Safety

  11. Classes of Fires CLASS A • Fires of ordinary combustibles that leave coal or ashes • Examples are wood, paper, cloth • Use water or dry chemical extinguishers

  12. Classes of Fires CLASS B • Fires of flammable liquids • Examples are gasoline or solvents • Use CO2 or dry chemical extinguishers • DO NOT use water – water is not effective because it just spreads the liquid around. • Gas pump safety video

  13. Classes of Fires CLASS C • Fires involving live electrical equipment • Examples are appliances, copiers, computers • Use CO2 or dry chemical extinguishers • DO NOT use water –could result in a severe shock

  14. Classes of Fires CLASS D • Fires that involve burning metals • Examples are Na, K, Li, Mg • Use sand or salt to put these out • DO NOT use water – can cause a violent reaction

  15. Classes of Fires CLASS E • Radioactive materials • Examples are uranium and plutonium • Special consideration is given at each site

  16. Extinguishing Fires Fires can be extinguished by: • Smothering the flames with a fire blanket or clothing. This removes the oxygen that the fire needs to continue burning. • Using a fire extinguisher. This removes the heat from the fire and cuts off the oxygen supply to the fire.

  17. Extinguishing Fires You need the correct type of fire extinguisher for the type of fire you are trying to control. **LHHS uses the Type ABC fire extinguisher.

  18. Extinguishing Fires To use a fire extinguisher properly: • Check to ensure you have the correct class of fire extinguisher for the fire you are dealing with • TWIST and pull the pin • aim the nozzle at the base of the fire • squeeze the lever • sweep the nozzle back and forth across the base of the fire. • NOTE: you are to exit the building immediately and pull the fire alarm on your way out, if a fire occurs. Do not attempt to put a fire out .

  19. Three times you should never try to fight a fire….. Just get out! • If the fire is too large • If you do not have the correct class of fire extinguisher • If the fire has the potential to block your only route of exit

  20. Types of Hazardous Waste • Flammable Substances • e.g. Antifreeze, propane, gasoline • Put in a flammable waste container • Heavy Metal Solutions • E.g. Cadmium, lead, barium • Put in a heavy metal waste container • Deep well burial • Precipitate the metal from solution

  21. Types of Hazardous Waste • Toxic Solutions • E.g. Chloroform, benzene, toluene • Place in a specially-labeled container (toxic waste) • Corrosive Solutions • E.g. Bleach, acid, drain cleaner • To dispose of a corrosive solution first dilute the substance with water then pour the diluted solution down the drain with plenty of water

  22. Question & Answer Q. Which is the ONLY type of solution that may be poured down the sink drain with plenty of water? A. Corrosive solutions may be poured down the sink ,as long as plenty of water is used to flush them down the drain.

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