{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Copy of Chem152_AES_Report_111711

Copy of Chem152_AES_Report_111711 - Name Michelle Bang ID...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Page 1 of 1 Name: Michelle Bang Quiz Section: AG Points assigned to tables, graphs ID Number: 1021913 Lab Partner: Tessa Barclay questions, and calculations. Chem 152 Experiment #6: Atomic Emission Spectroscopy (AES) Part II. Measuring the Hydrogen Emission Spectrum Part I. An Application of AES: Determination of Sodium Total Points = 60 (5 notebook, 55 template) 5 Part II. Measuring the Hydrogen Emission Spectrum DATA Table 1. Hydrogen Emission Data Spectroscope Data Ocean Optics Spectrometer Color Wavelength, nm violet 435 845.3 blue-green 485 778.2 red 660 657.1 651.3 486.3 A: Data Analysis 2 0.25000 845.3 0.0011830 3 0.11111 778.2 0.0012850 4 0.06250 657.1 0.0015218 1 5 0.04000 651.3 0.0015355 6 0.02778 486.3 0.0020562 2 Slope: -0.0028304 R from slope: 0.0028304 No y-intercept: 0.0017945 R from y-intercept: 0.0017945 3 3 0.11111 845.3 0.0011830 4 0.06250 778.2 0.0012850 5 0.04000 657.1 0.0015218 1 6 0.02778 651.3 0.0015355 7 0.02041 486.3 0.0020562 2 Slope: -0.0074489 R from slope: 0.0074489 Yes y-intercept: 0.0019063 R from y-intercept: 0.0076252 3 4 0.062500 845.3 0.00118297 5 0.040000 778.2 0.00128497 6 0.027778 657.1 0.00152184 1 7 0.020408 651.3 0.00153551 8 0.015625 486.3 0.00205622 2 Slope: -0.015004 R from slope: 0.015004 No y-intercept: 0.002015 R from y-intercept: 0.018135 3 7.537E+06 1.906E+06 1 B: Ionization Energy and Energy Levels h (Planck's const) c (speed of light) IE(per atom) 6.626E-34 2.998E+08 3.786E-37 Js m/s J 2 IE(per atom) 3.786E-19 J 2 Avogadro's # 6.022E+23 IE (per mole) 4.494E+05 J/mole 2 The cells under the h, c, and R headings below will autofill from cells B140, C140, and B133, respectively, so you just need to enter the formula in Column F to calculate En. n h c R 6.626E-34 2.998E+08 7.537E+06 1.495E-18 4 6.626E-34 2.998E+08 7.537E+06 9.340E-20 2 3 6.626E-34 2.998E+08 7.537E+06 1.662E-19 2 6.626E-34 2.998E+08 7.537E+06 3.739E-19 1 6.626E-34 2.998E+08 7.537E+06 1.495E-18 Part II. An Application of AES: Determination of Sodium DATA Molar mass of NaCl 58.44 g/mole Calculated mass of NaCl needed to make 100 mL of 0.100 M stock solution 0.5844 g Actual mass of NaCl weighed out 0.5840 g Actual molarity of stock NaCl solution prepared 5.8400 M Volume of 0.100 M stock NaCl solution for preparing 100 mL of each standard Desired mL of 0. 1M NaCl Standard Final [NaCl] (M) needed 1 0.0010 1 mL 2 0.0008 .8 mL 3 0.0006 .6 mL 4 0.0004 .4 mL 5 0.0002 .2 mL 1 Table 5: Flame Photometer Data Sample Intensity Standard 1 0.00100 5.40 100 Standard 2 0.00080 4.40 79 Standard 3 0.00060 3.30 63 1 Standard 4 0.00040 2.20 42 Standard 5 0.00020 1.10 57 Table 5 (continued) Sample Dilution Factor Intensity Gatorade 0.021829 25 85 Coca Cola 0.00035365 2.5 40 Site #1, 8.5 m depth 0.00056220 1 66 Site #1, 9.5 m depth 0.001128 2 66 Site #1, 10.5 m depth 0.007430 10 77 Site #1, 11.5 m depth 0.019024 100 43 Seawater 0.42731 400 97 DATA ANALYSIS 2 slope 61500 y-intercept 31.30 What percent of the labeled value is the measured value? 119 mg/8 fl. oz, sports drink 110 8 % measured vs labeled values 2 2 mg/8 fl. oz. for the cola drink 35 94 % measured vs labeled values 3 Freshwater samples as a function of depth: Depth (m) Intensity Dilution Factor Concentration (M) 8.5 66 1 0.00056220 9.5 66 2 0.001128 1 10.5 77 10 0.007430 11.5 43 100 0.019024 2 At the deepest point, what is the ratio of Seawater to Freshwater? What about the most shallow point? Dilution Factor Intensity Concentration (M) Seawater 400 97 0.42731 Dilution Factor = [Na Seawater]/[Na Freshwater, deepest point or most shallow point] deepest 22.5 most shallow 76 2 3 RESULTS AND DISCUSSION 2 2 2 2 2 1 60 λ (nm) (descending order) Table 2. Hypothesis #1; n f = 1; n i = 2, 3, 4, 5, 6 n i values 1/n i 2 λ (nm) 1/ λ nm -1 nm -1 Is n f =1?
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}