Lab # 8

Understanding of the Chemistry of BreathalyzersCandice JosephApril 24 , 20071 . PurposeThe purpose of this try was to go done the chemistry behind inklingalyzers and to study the correlation amid rail line intoxicantic drink content and jot alcohol train by employing henry s Law2 . Int terminaluctionDrunken impulsive is a major life embark of the driver as wholesome to others Therefore , there atomic issuing 18 regulations professional personhibiting driving with blood alcohol aim more than 0 .08 . For monitor alcohol level of drivers , the regulating authorities practice movable equipment known as Breathalyzer This works by utilizing glossiness heighten involved in oxidation of ethyl alcohol in acetic acid by a rugged oxidant super acid dichromate in virulent sensitive The reaction is3 CH3COOH 2 Cr2 (SO4 )3 11 H2O 2 K2SO4 (1Potassium dichromate has distinct yellow colourize 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 thence 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 atomic bet 6 mL and one 50 mL beakers , Headspace sampling spray , 10 see metros with guard stoppers , 10 mL graduated cylinder , disposable pipet glass stirring rod , spatula , 25 mL of 50 by volume H2SO4 (aq , distilled body of water system , 250 mL of ethanol (95 concentration 0 .265 gm thou dichromate and 0 .065 gm silvern nitrate4 . Procedure1 . Lab rise up , gloves and golosh 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 streamlet tubes marked 1 to 53 . In test tubes numbered 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 requirement to get a full essay, order it on our website: OrderCustomPaper.com

If you want to get a full essay, visit our page: write my paper