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#1 Quantitative Analysis and Beer's Law

# #1 Quantitative Analysis and Beer's Law - Aaron King...

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Aaron King 660556233 Section 2 Wednesday, September 12, 2007 #1 Quantitative Analysis and Beer's Law 1. The true molarity of the stock solution was 0.2001McoCl 2 . . × 4 761gCoCl2 1 . = . . × = molCoCl2237 93gCoCl2 0 02001molCoCl20 02001molCoCl2100mlH2O 1000ml1L . 0 2001MCoCl2 2. Chart of Dilutions Sample Volume of Stock Total Volume New Concentration 1 20mL 25mL 0.16M 2 15mL 25mL 0.12M 3 10mL 25mL 0.080M 4 5mL 25mL 0.04M = M1V1 M2V2 = M2 M1V1V2 = . M2 0 20M20mL25mL = . M2 0 16M 3. Chart of Absorbance Sample Absorbance #1 Absorbance #2 Absorbance #2 Average Stock 1.000A 0.970A 0.985A 0.985A 20mL 0.830A 0.732A 0.702A 0.755A 15mL 0.590A 0.604A 0.594A 0.598A 10mL 0.406A 0.398A 0.460A 0.421A

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King 2 5mL 0.205A 0.233A 0.215A 0.218A Unknown 0.740A 0.748A 0.746A 0.745A = + + A A1 A2 A33 = . + . + . A 0 830A 0 732A 0 702A3 = . A 0 755A 4. See Page 3 a. The physical significance of this line is a prediction for the absorbance of CoCl 2 for the amount of mL of CoCl 2 solution in the solution. 5. By using the Beer’s Law plot and the slope, the original molarity of the unknown solution
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#1 Quantitative Analysis and Beer's Law - Aaron King...

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