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University of Minnesota Twin Cities
CHEM 2121
Nicholas Frost

Chapter 2 Book NotesTools of the Trade21 Safe Ethical Handling of Chemicals and WastePrimary safety rule familiarize self w hazards then do nothing that you or whoevers in charge consider dangerousSafety features of labowear gogglessafety glasses w side shields all the timeocontact lenses not recommended bc vapors can get trapped btwn lens and eyeoflameresistant lab coat to protect skin from skills and flamesorubber gloves when pouring concentrated acidsodont eatdrinkHandle organic solvents concentrated acids and concentrated ammonia in fume hood bc air flows into hood keeps fumes out dilutes fumes before expelling them from roofonever generate lot of toxic fumes thatallowed to escape through hoodowear respirator for handling fine powders bc produce dust cloud can be inhaledClean spills immediately so next person who comes doesnt accidentally contact itstotreat spills on skin 1 flood w wateroknow where and how to use emergency shower and eyewashstoif sink closer than eyewash use it 1 for eye splashesoknow how to operate fire extinguisher emergency blanketoknow wherefirst aid kit and howwhere to seek medical assistanceLabel all vessels for what they contain or else might forget and expensive disposal need to analyze whats in itoNational Fire Protection Association labels shows hazards associated w reagentsoMaterial Safety Data Sheet given w each chemical sold in USA lists hazardsprecautions for that chemicalfirst aid proceduresinstructions for handling spillsRecycling chemicals preferred to waste disposal when economically feasible2oex carcinogenic dichromate CrO waste27oCrIV should be reduced CrIII less toxic w sodium hydrogen sulfite NaHSOprecipitated w hydroxide as insoluble CrOH33oThen soln evaporated dryness solid discarded in approved landfill whichlined so that prevents chemical escapeowastes like goldsilver that can be economically recycled should be chemically treated to recover the metalGreen chemistry principle set meant to change our behavior help sustain habitable planetounsustainable ex consuming limited resource carelessly disposing wasteogreen chemistry design chem productsprocesses to reduce resources energy hazardous waste generationoBetter to prevent waste rather than dispose itoex NH can be measured w ionselective electrode not using spectrophotometric 3Nessler procedure makes HgI waste2
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