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MT1-Sp10-v4 - Name GSI Chemistry 4B Spring 2010 Name...

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Name________________________ GSI________________ Page 1 of 7 Chemistry 4B, Spring 2010 February 12, 2010 (50 min., closed book) Name: GSI: SID: Section: Write your name and that of your GSI on all 7 pages of the exam. Equations, constants, and data are provided below. In order to maximize your score on the exam: Do the questions you know how to do first. Circle your final answer. Go back and spend more time on the questions you find more challenging. Budget your time carefully don't spend too much time on one problem. Show all work for which you want credit and don't forget to include units. For the explanation sections, try keep your answers brief as well as complete. Topic Question Page Points Score ICP AES of Cigarettes Q1 4 2 20 ICP AES of Cigarettes Q5 7 3 20 HPLC of Vanillin Q8 4 5 HPLC of Vanillin Q9 12 5 25 EDTA Q13 18 7 30 Useful Equations and Constants: ݁ ൌ ට݁ ൅ ݁ ൅ ݁ ൌ ට%݁ ൅ %݁ ൅ %݁ E = h  = c ܰ ܰ ݃ ݃ ݁ ି∆ா ௞் Analyte mobile Anlayte stationary K = C s /C m ܰ ൌ 16ݐ ݓ ܴ݁ݏ݋݈ݑݐ݅݋݊ ൌ ∆ݐ ݓ ௔௩ pH = log[H 3 O + ] pX = log X Constants: N 0 = 6.02214 x 10 23 mol 1 k b = 1.380 × 10 23 J K 1 h = 6.62607 × 10 34 J s m e = 9.101939 × 10 31 kg c = 2.99792 × 10 8 m s 1 1 nm = 10 9 m = 10 6
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Name________________________ GSI________________ Page 2 of 7 ICP AES of Cigarette Ash ICP AES Instrument Setup Copper (Cu) Zinc (Zn) Detected wavelength (nm) 324.754 213.856 Cigarette ash was tested for the presence of heavy metals using ICP AES. A cigarette was lit and allowed to smolder for several minutes. A mass of 0.1054 g of ash was collected and dissolved in 2 mL of concentrated nitric acid, HNO 3 . The solution was filtered and then transferred to a 25.00 mL volumetric flask and diluted to the mark with distilled water. A series of metal standards were prepared and the
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