CheatSheet7

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

This preview shows pages 1–2. Sign up to view the full content.

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

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 2

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

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online