Chemistry 2223B Chapter Notes -Molar Attenuation Coefficient, Molar Mass, Test Tube
10 Nov 2013
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Determining the concentration of an unknown solution cocl2 6h20 using spectroscopy. We must use the max for the experiment. Max by adjusting the wavelength to find the wavelength that has the highest absorption with the lowest transmission. 650 n o i t p r o s b. As shown in the graph above, the absorption peaks somewhere between 500 525 nm. We can now zero in and use the absorption spectrum at every 10 nm to find a more precise max. From the chart above, we can see that the wavelength 510nm gives the highest absorption and the lowest transmission. This means that we will be using this transmission for the rest of the experiment. Our test tube #1 was 100% of our cobalt chloride solution. Test tube #2 had 80% of our cobalt chloride solution. Test tube #3 had 60% of our cobalt solution and so on. Our cobalt chloride solution was made to be a 0. 14 molarity solution.
