Question

State four procaution necessary to obtain accurate results in the experiment you have described

Answer 1

Answer:

• Be careful when packing melting point tubes or using Pasteur pipettes - glass capillaries and pipettes are very fragile and can result in cuts to the hand.  

• Broken glassware should be CLEANED and then disposed of in the yellow ‘Broken Glass’ containers.  

• Do NOT force glass tubing through corks or stoppers. Use lubricant if necessary.  

• Hot glassware burns! (Hot glassware looks the same as cold glassware!)  

• Chemical reagents should always be stored in labeled bottles. Read the label carefully before using the reagent. Do not take more than the required amount of chemical and do NOT return any unused chemical back to the reagent bottle.  

• Solid waste should be disposed of in the ‘Solid Waste’ container in the fumehood.  

• Organic liquid waste should be disposed of in the ‘Organic Liquid’ waste container located in the fumehood.  

• Chemically contaminated paper (e.g. filter paper, weigh paper) should be disposed of in the contaminated paper waste container (located in the fumehood).  

• Paper waste is discarded in the waste paper basket found under the central sink.  

• Silica gel and TLC plates should be disposed of in the silica waste container (in the fumehood).

• Mercury spills from broken thermometers must be cleaned up immediately. Notify your TA and obtain a mercury clean up kit from the chemistry store room (W1-32).  

• Dilute aqueous inorganic solutions, acids, and bases can be disposed of down the drain with large volumes of water.  

• Do NOT pour any organic liquids (including acetone!) down the drain. If you are not sure, please ask your TA.  

• At the end of the lab, ensure that your gallenkamp and digital thermometer are turned OFF.