Difference between revisions of "Ch4 Lec 8"
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===Dilution Activity=== | ===Dilution Activity=== | ||
| − | + | A lab was originally planned but is now being used as a class activity. In this activity/lab, you were going to determine the concentration of the blue dye found in a "blue" PowerAde sports drink. Although the many details associated with the lab are outlined in the [http://esr.monmsci.net/wiki/images/8/86/Lab_Molarity_dilutions.pdf Molarity Lab], the basic take home message is...if you make a set of 3 solutions/dilutions of the blue dye and you use a spectrophotometer to measure how much light is absorbed by the solution (aka, the "absorbance") then you can generate a set of data to complete the following table: | |
[[File:Screen Shot 2020-03-20 at 10.47.22 AM.png|400px]] | [[File:Screen Shot 2020-03-20 at 10.47.22 AM.png|400px]] | ||
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| − | [ | + | If the [blue dye solution 1] = 0.01 M, [blue dye solution 2] = 0.02 M, [blue dye solution ] = 0.03 M (these are referred to as your "standards"), and solution 1 absorbance is 0.2, solution 2 absorbance is 0.4, solution 3 absorbance is 0.6, AND the sports drink absorbance is 0.5, then you can process this data as described below to determine the concentration of the blue dye in the sports drink. |
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[https://youtu.be/AN4KifV12DA Crash Course Video] | [https://youtu.be/AN4KifV12DA Crash Course Video] | ||
Revision as of 15:58, 20 March 2020
Don't read ahead :), this lecture is not yet complete.
Dilutions
Dilution Worksheets
The following worksheets were originally planned as a pre-lab activity...i did not reformat them for these "lecture notes."
- Please complete these worksheets --> Concentration, Molarity, and Dilutions worksheets
Dilution Activity
A lab was originally planned but is now being used as a class activity. In this activity/lab, you were going to determine the concentration of the blue dye found in a "blue" PowerAde sports drink. Although the many details associated with the lab are outlined in the Molarity Lab, the basic take home message is...if you make a set of 3 solutions/dilutions of the blue dye and you use a spectrophotometer to measure how much light is absorbed by the solution (aka, the "absorbance") then you can generate a set of data to complete the following table:
If the [blue dye solution 1] = 0.01 M, [blue dye solution 2] = 0.02 M, [blue dye solution ] = 0.03 M (these are referred to as your "standards"), and solution 1 absorbance is 0.2, solution 2 absorbance is 0.4, solution 3 absorbance is 0.6, AND the sports drink absorbance is 0.5, then you can process this data as described below to determine the concentration of the blue dye in the sports drink.