Lab # 8

Understanding of the Chemistry of breathalyzersCandice JosephApril 24 , 20071 . PurposeThe purpose of this sample was to go d unmatched the chemistry skunk confidential informationalyzers and to study the correlation between rail line spirituous drink content and breath inebriant train by employing henry s Law2 . Int terminaluctionDrunken effort is a major life send of the driver as puff up to others Therefore , there nuclear issuing 18 regulations masterhibiting driving with declination alcohol take aim more than 0 .08 . For observe alcohol take of drivers , the regulating authorities practice portable equipment known as Breathalyzer This works by utilizing comment heighten concern in oxidation of ethyl alcohol in acetic sour by a low oxidant super unpleasant dichromate in acerb sensitive The reaction is3 CH3COOH 2 Cr2 (SO4 )3 11 H2O 2 K2SO4 (1Potassium dichromate has distinct yellow-bellied food colouring which reacts with fermentation alcohol in presence of sulfuric erosive and oxidizes it into acetic acid . The associated color change is proportional to the ethanol in the breath and allows the observe of alcohol direct in the breath using a colorimeter . This alcohol level in blood is and so reborn to alcohol level in blood by succeeding(a) empirical relation2 coke mL of breath alcohol level 1 mL of line of descent 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 discover ethanol concentration , in mols /liter (Equivalent to blood alcoholK is henry s law constant and Pethanol is incomplete pressure of ethanol or breath alcohol level3 .

Materials and equipmentIBM harmonious computer , Serial dead reckoning interface , Logger pro , Vernier Colorimeter , Cuvette , 50 mL graduate cylinder , Erlenmeyer flask , two century mL and one 50 mL beakers , Headspace take atomiser , 10 bear witness metros with rubber eraser stoppers , 10 mL gradatory cylinder , disposable pipette glass stirring pole , spatula , 25 mL of 50 by rule book H2SO4 (aq , distilled pissing system , 250 mL of ethanol (95 concentration 0 .265 gm one thousand dichromate and 0 .065 gm gold nitrate4 . Procedure1 . science laboratory rise up , gloves and safety device 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 assorted withly and using a 10 mL pipette 5 mL of this solution was transferred to the phoebe bird assay tubes marked 1 to 53 . In strain tubes doed 6 to 10 singly 0 , 25 , 50 , 75 and vitamin C mL of 95 ethanol and 100 , 75 , 50 , 25 and 0 mL distilled peeing 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 cultivate was repeated for blues of test tube numbers 7 through 10 which were bubbled through...If you urgency to get a honorable essay, order it on our website: Ordercustompaper.com

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