CHM235_236_Safety_Handout.pdf - 1 Laboratory Safety &...

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1Laboratory Safety & EquipmentINTRODUCTIONThe purpose of this exercise is to introduce safety requirements for the chemical laboratory and outlineprocedures for cleaning laboratory equipment. Chemists use specific methods of cleaning laboratoryequipment in order to minimize contamination and ensure experimental results. For chemists, propermeasurements rely on clean and uncontaminated equipment.KEY OBJECTIVESDescribe the safety requirements for the laboratory.Identify and classify common hazardous materials.Use proper methods to clean laboratory glassware and equipment.METHODSCleaning Laboratory EquipmentLaboratory procedures require systematic glassware cleaning for good lab results. Laboratoryequipment should be physically clean and free of both chemical and grease residue.1. Laboratory BenchThe laboratory bench should be cleaned before and after every use. The laboratory room holds bothlectures and labs and should be cleaned before and after each.1.Spray the entire bench surface with tabletop cleaner.2.Using paper towels, wipe down the surface and the edges.3.If grease or residue is present, spray the residue with ethyl alcohol and rub with a paper towel toremove the residue.4.Make sure the bench is completely dry before using it.2. Check Equipment for Chips, Cracks, Abrasions, and ResidueChips, Cracks, and Abrasions -Inspect glass surfaces for chips, cracks, or abrasions before everyuse to avoid breakage on heating or handling. Return all defective glassware and obtainreplacements.Wash glassware immediately after use- If not cleaned immediately some residues are impossible toremove.Test for Residue –Grease or residues will cause certain areas to repel or attract water. Theycontaminate test results and alter the measurements.3. Steps for Cleaning Glassware1. Pour a small amount (approximately½- 1 teaspoon) of glassware detergent into a tub of warmto hot water. Hot water is available in the faucets in the hoods. Soak glassware in the soapywater.2.Use a soft brush to clean surfaces.3.Rinse 3 times with tap water.4.Rinse with 5 mL of distilled or deionized water. Test for residue by rolling glassware with thedistilled water to see if the water wets all the inner surfaces equally. If it does not, grease orresidue is present.5.If grease or residue is present, spray the inside of the glassware with ethyl alcohol and rinsewith 5 more mL of distilled or deionized water.
4. Steps for Cleaning the Tabletop Laboratory BalanceIn this course you will use a tabletop centigram balance for laboratory exercisesrequiring many measurements. You will use the analytical balances at the side ofthe room for specific lab exercises.1.Lift the metal pan gently to remove the pan.

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Term
Summer
Professor
NoProfessor
Tags
Chemistry, Laboratory Safety Equipment

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