Lab # 8

Understanding of the Chemistry of BreathalyzersCandice JosephApril 24 , 20071 . PurposeThe purpose of this taste was to go done the chemistry behind intimationalyzers and to study the correlation amongst rail line intoxicantic drink content and lead alcohol train by employing henry s Law2 . Int terminaluctionDrunken operate is a major life embark of the driver as thoroughly to others Therefore , there atomic issuing 18 regulations prohibiting driving with blood alcohol train more than 0 .08 . For observe alcohol level of drivers , the regulating authorities practice takeout equipment known as Breathalyzer This works by utilizing colour in heighten involved in oxidation of ethyl alcohol in acetic acid by a low oxidant super acid dichromate in acid-forming sensitive The reaction is3 CH3COOH 2 Cr2 (SO4 )3 1 1 H2O 2 K2SO4 (1Potassium dichromate has distinct yellow pretense which reacts with ethyl alcohol in presence of sulfuric acid and oxidizes it into acetic acid . The associated color change is proportional to the ethanol in the breath and allows the monitor of alcohol level in the breath using a colorimeter . This alcohol level in blood is then(prenominal) reborn to alcohol level in blood by succeeding(a) empirical relation2 coke mL of breath alcohol level 1 mL of Blood alcohol content (BACUsing henry s practice of law , one can compare the breath alcohol level to blood alcohol contentCg , ethanol in blood KPethanol (2Where , Cg is fade out ethanol concentration , in mols /liter (Equivalent to blood alcoholK is Henry s law constant and Pethanol is fond(p) pressure of ethanol or breath alcohol level3 . Materials and equipmentIBM harmonious computer , Serial stroke interface , Logger pro , Vernier Colorimeter , Cuvette , 50 mL graduate cylinder , Erlenmeyer flask , tw o blow mL and one 50 mL beakers , Headspace! sampling spray , 10 tryout metros with meritless stoppers , 10 mL graduated cylinder , disposable pipet glass stirring rod , spatula , 25 mL of 50 by volume H2SO4 (aq , distilled piddle system , 250 mL of ethanol (95 concentration 0 .265 gm one thousand dichromate and 0 .065 gm currency nitrate4 . Procedure1 . Lab rise up , gloves and prophylactic glasses were used as safety tone during the experiment as the experiment involved handling of hazards chemicals2 . 25 mL of 50 by volume H2SO4 (aq ) was transferred in an Erlenmeyer flask and 0 .065 gm potassium dichromate and 0 .065 gm silver nitrate was added into it . The dissolvent was mixed by dint ofly and using a 10 mL pipette 5 mL of this solution was transferred to the fivesome running game tubes marked 1 to 53 . In test tubes offspringed 6 to 10 respectively 0 , 25 , 50 , 75 and 100 mL of 95 ethanol and 100 , 75 , 50 , 25 and 0 mL distilled water was added4 . 20 cm3 of vapor from test tube number 6 was placid usin g handspace sampling syringe and bubbled through the potassium dichromate solution in test tube number 1 and again anther 20 cm3 was also collected and bubbled through the same solution . This exercise was repeated for blues of test tube numbers 7 through 10 which were bubbled through...If you insufficiency to get a full essay, order it on our website: OrderCustomPaper.com

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