Determining the Concentration of a Solution: Beer's Law - Vernier ...
Determining the Concentration of a Solution: Beer's Law - Vernier ...
Determining the Concentration of a Solution: Beer's Law - Vernier ...
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Experiment 11Colorimeter with a blank cuvette in <strong>the</strong> slot). If you have an older model Colorimeter, seewww.vernier.com/til/1665.html for calibration information.10. This experiment gives you a good opportunity to discuss <strong>the</strong> relationship between percenttransmittance and absorbance. At <strong>the</strong> end <strong>of</strong> <strong>the</strong> experiment, students can click <strong>the</strong>Absorbance vertical-axis label <strong>of</strong> <strong>the</strong> graph, and choose Transmittance. The graph shouldnow be transmittance vs. concentration. You can also discuss <strong>the</strong> ma<strong>the</strong>matical relationshipbetween absorbance and percent transmittance, as represented by ei<strong>the</strong>r <strong>of</strong> <strong>the</strong>se formulas:A = log(100 / %T) or A = 2 – log%TSAMPLE RESULTSTrial<strong>Concentration</strong>(mol / L)Absorbance1 xxxx xxxx2 xxxx xxxx3 xxxx xxxx4 xxxx xxxx5 xxxx xxxx6 xxxx xxxx<strong>Concentration</strong> <strong>of</strong> <strong>the</strong> unknownxxxx mol/LAbsorbance vs. concentration for NiSO 4with interpolation <strong>of</strong> <strong>the</strong> unknown displayed11 - 2 T Chemistry with <strong>Vernier</strong>
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