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Investigation 1 – PostLab









Determine the concentration of the unknown solution by using the absorbance data to create a concentration curve. Scientists that perform spectrophotometric work create a concentration curve by plotting the concentration of known solutions as compared to the absorbance of unknown solutions.

Complete the Analysis Questions in your SDR then discuss them as a class. 

  • Study the concentration curve. What is the concentration of food coloring in the unknown sample? 
  • What do you think a transmittance graph would look like? Support your predictions. 


Complete the Focus Question in your SDR then discuss it as a class. 

  • What is the relationship between the absorption and transmission of light through transparent substances?