Question

Explain how the information given below could be used to determine the concentration of an unknown sample.

Concentration (M)
0.20
0.3
0.40
0.50
Absorbances
0.27
0.41
0.55
0.69

Answer 1

See below

Explanation:Plot the known concentrations and adsorbance data. Draw a best fit line through thwe points. When the absorbance of a solution of unknown concentration (but same substance) is determined, find the concentration from the line at that absorption value. See attached graph.

E.g., an sample of the same substance had an absorbance of 0.35. Find that on the x scale and then determine the concentration that would be required to produce that level of absorbance. 0.483M in this case.