CheatSheet7 - CH204 Spring 2009 Cheat Sheet for Experiment...

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CH204 Spring 2009 Cheat Sheet for Experiment 7. Visible Spectrophotometry. Molecular Formula Determination 1 Part 4. Iron Content Determination by Visible Spectrophotometry Known: Absorbance of the Fe(phen) 3 2+ sample, A Molar absorptivity for Fe(phen) 3 2+ at 510 nm, ε (M –1 cm –1 ) Dilution factors Pathlength, l = 1 cm Mass of the complex iron sample analyzed (g) To be determined: Moles of Fe 3+ per gram of sample (mole/g) Calculations: 1. ε l A = + ) (Fe(phen) M 2 3 (mole/L) 2. Total dilution factor = 5 × 5 × X , where X is your final dilution 3. M original (Fe 3+ ) = M ) ) phen ( Fe ( 2 3 + × Total dilution factor 4. In 25 ml of solution: moles Fe 3+ = L 025 . 0 ) (Fe M 3 original × + 5. (g) sample of mass e F oles m sample /g e F Moles 3 3 + + = K x Fe y (C 2 O 4 ) x ·zH 2 O Molecular Formula Determination Known: Moles of C 2 O 4 2– per gram of sample (mole/g sample) Moles of K + per gram of sample (mole/g sample) Moles of Fe 3+ per gram of sample (mole/g sample) y = 1
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CheatSheet7 - CH204 Spring 2009 Cheat Sheet for Experiment...

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