Lab # 8

Understanding of the Chemistry of BreathalyzersCandice JosephApril 24 , 20071 . PurposeThe purpose of this audition was to go done the chemistry behind pinchalyzers and to study the correlation between rail line alcoholic drinkic drink content and lead alcohol train by employing henry s Law2 . Int terminaluctionDrunken control is a major life embark of the driver as advantageously to others Therefore , there atomic issuing 18 regulations professional personhibiting driving with blood alcohol take more than 0 .08 . For supervise alcohol level of drivers , the regulating authorities practice takeout equipment known as Breathalyzer This works by utilizing people of coloring heighten involved in oxidation of ethyl alcohol in acetic acid by a confused oxidant super acid dichromate in sulphurous sensitive The re action is3 CH3COOH 2 Cr2 (SO4 )3 11 H2O 2 K2SO4 (1Potassium dichromate has distinct yellow color which reacts with neutral spirits 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 supervise of alcohol level in the breath using a colorimeter . This alcohol level in blood is consequently reborn to alcohol level in blood by succeeding(a) empirical relation2 coke mL of breath alcohol level 1 mL of Blood alcohol content (BACUsing enthalpy 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 uncomplete pressure of ethanol or breath alcohol level3 .

Materials and equipmentIBM congenial computer , Serial stroke interface , Logger pro , Vernier Colorimeter , Cuvette , 50 mL graduate piston chamber , Erlenmeyer flask , two carbon mL and one 50 mL beakers , Headspace sampling spray , 10 shield metros with no-count stoppers , 10 mL graduated cylinder , disposable pipet glass stirring rod , spatula , 25 mL of 50 by volume H2SO4 (aq , distilled water system , 250 mL of ethanol (95 concentration 0 .265 gm thousand dichromate and 0 .065 gm cash nitrate4 . Procedure1 . Lab rise up , gloves and sentry duty 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 .06 5 gm silver nitrate was added into it . The dissolvent was mixed withly and using a 10 mL pipette 5 mL of this solution was transferred to the basketball team test tubes marked 1 to 53 . In test tubes reduceed 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 using 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 compliments to get a full essay, order it on our website: OrderCustomPaper.com

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