Lab Write-Up

Lab Write-Up - Lab 3 Spectrophotometric Determination of...

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Lab # 3: Spectrophotometric Determination of   Concentration Michael McLennon Ankur Gupta Melinda Box CHM 21 February 9, 2009

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Lab # 3: Spectrophotometric Determination of Concentration  Table 1.2 of Observed Absorbencies at Certain Wavelengths of the 1.0 M Cobalt (II)   Nitrate Hexahydrate Solution Wavelength Absorbance 546 0.281 526 0.483 506 0.537 486 0.443 488 0.455 492 0.474 496 0.489 500 0.516 502 0.525 504 0.534 505 0.534 506 0.537 507 0.542 509 0.547 510 0.547 511 0.557
Graph # 1 * Wavelength of maximum absorbance is 511 nm with an absorbance of 0.557 Table 1.3 of Observed Absorbencies of Known and Unknown Concentrations of   Cobalt (II) Nitrate Hexahydrate Solution at a Wavelength of 511 nm Sample Absorbance 0.10 M .544

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0.08 M .442 0.06 M .332 0.04 M .228 0.02 M .112 Unknown A .294 Unknown B .430 Unknown C .155 Unknown D .061 Graph # 2 Data Analysis In order to find the concentration of the unknown solution we must use the trendline  derived from the graph of concentration versus absorbance, using it we must insert the
absorbance of the  Cobalt (II) Nitrate Hexahydrate  solution with unknown  concentration for y and then solve for x (the concentration of solution), the calculation  for each unknown is shown below.

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Lab Write-Up - Lab 3 Spectrophotometric Determination of...

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