5 Skoog Douglas 1962 Fundamentals of Analytical Chemistry Holt Rinehart and

5 skoog douglas 1962 fundamentals of analytical

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[5] Skoog, Douglas. 1962 Fundamentals of Analytical Chemistry ” Holt, Rinehart and Winston, Inc. APPENDIX A. Computation of Cu (II) ppm ppmStd sol ' ( Lsol ' n÷Ltotal ) = ppm Take L sol’n = 2 ml ( 2500 mg L ) × ( 0.002 L .05 L ) = 100 ppm B. Concentration (x) from linear equation given absorbance (y) x = y + yintercept slope ppm Take absorbance = 0.138 x = 0.138 + 0.0148 0.0009 = 169.78 ppm C. Average Concentration and Absorbance (Trial 1 +Trial 2 +Trial 3 )/3 169.78 + 170.89 + 170.89 3 = 170.52 ppm D. Concentration of Unkown Solution 4
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Concentration sample×Vdiluted sol ' n VolumeAliquot = ppm Take Concentration Sample = 169.78 ppm 169.78 ppm× 0.05 L 0.006 L = 1415 ppm E. Percent Deviation Concentration 1250 ppm 1250 × 100% = ¿ Take Concentration = 1421 ppm 1421 1250 1250 × 100 = 13.68% D. Pooled Standard Deviation ¿ ( Xk X 3 ) 2 ( n 1 + n 2 + n 3 + ns ) ( Xi X 2 ) 2 + k = 1 n 3 ¿ i = 1 n 1 ( Xi X 1 ) 2 + j = 1 n 2 ¿ ¿ ¿ Spooled = ¿ 0.823045267 + 0.823045267 + 0 9 3 = 0.524 RAW DATA GROUP A Team A 6 mL Max λ 606.0 nm Calibration Curve Concentra tion ppm: 2500 V working std mL Cu ppm Absorbanc e 2 100 0.082 4 200 0.17 6 300 0.268 8 400 0.366 10 500 0.456 Sample Analysis Aliquot froms Stock 6 Diluted Unknown 50 Trial Absorba nce Concentra tion (ppm) 1 0.138 169.77777 78 2 0.139 170.88888 89 5
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3 0.139 170.88888 89 Average 0.138666 667 170.51851 85 0 100 200 300 400 500 600 0 0.1 0.2 0.3 0.4 0.5 f(x) = 0 x − 0.01 R² = 1 Calibration Curve Concentration Absorbance GROUP B Team B 11 ml max wavelengt h 599 Calibration Curve Concentra tion ppm: 2500 V working std mL Cu ppm Absorbance 2 100 0.093 4 200 0.18 6 300 0.281 8 400 0.365 10 500 0.458 Sample Analysis Aliquot froms Stock 11 Diluted 50 Unknown Trial Absorba nce Concentrati on 1 0.26 289.8888889 2 0.259 288.7777778 3 0.259 288.7777778 A verage 0.259333 333 289.1481481 50 100 150 200 250 300 350 400 450 500 550 0 0.1 0.2 0.3 0.4 0.5 f(x) = 0 x + 0 R² = 1 Calibration Curve Concentration Absorbance GROUP C Team C 14 mL Max λ 602.0 nm Calibration Curve Concentratio n ppm: 2500 V working std mL Cu ppm Absorban ce 2 100 0.085 4 200 0.183 6 300 0.273 8 400 0.372 10 500 0.457 6
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Sample Analysis Aliquot froms Stock 14 Diluted Unknown 50 Trial Absorban ce Concentr ation 1 0.32 362.11111 11 2 0.32 362.11111 11 3 0.32 362.11111 11 Average 0.32 362.11111 11 50 100150200250300350400450500550 0 0.1 0.2 0.3 0.4 0.5 f(x) = 0 x − 0.01 R² = 1 Calibration Curve Concentration Absorbance 7
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