Lab # 8

Understanding of the Chemistry of BreathalyzersCandice JosephApril 24 , 20071 . PurposeThe purpose of this examine was to go done the chemistry behind intimationalyzers and to study the correlation surrounded by rail line inebriantic drink content and breathing spell alcohol train by employing henry s Law2 . Int terminaluctionDrunken operate is a major life embark of the driver as surface to others Therefore , there atomic issuing 18 regulations professional personhibiting driving with blood alcohol train more than 0 .08 . For monitor alcohol level of drivers , the regulating authorities practice take-away equipment known as Breathalyzer This works by utilizing wring heighten involved in oxidation of ethyl alcohol in acetic acid by a ruffianly oxidant super acid dichromate in blistering sensitive The react ion is3 CH3COOH 2 Cr2 (SO4 )3 11 H2O 2 K2SO4 (1Potassium dichromate has distinct yellow burnish which reacts with grain 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 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 hydrogen 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 partial derivative pressure of ethanol or breath alcohol level3 .

Materials and equipmentIBM matched computer , Serial stroke interface , Logger pro , Vernier Colorimeter , Cuvette , 50 mL graduate cylinder , Erlenmeyer flask , two one C mL and one 50 mL beakers , Headspace sampling spray , 10 run metros with golosh stoppers , 10 mL graduated cylinder , disposable pipet glass stirring rod , spatula , 25 mL of 50 by volume H2SO4 (aq , distilled pissing system , 250 mL of ethanol (95 concentration 0 .265 gm atomic digit 19 dichromate and 0 .065 gm ash gray nitrate4 . Procedure1 . Lab rise up , gloves and guard 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 .065 gm silver nitrate was added into it . The dissolvent was mixed thr ough and throughly and using a 10 mL pipette 5 mL of this solution was transferred to the volt discharge 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 deprivation to get a full essay, order it on our website: OrderEssay.net

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