A student prepares the set of standard solutions shown in the table and records their…
CHEMISTRY · Multi-part · AP · Chemistry · Properties of Substances and Mixtures · Properties of Substances and Mixtures
Problem
A student prepares the set of standard solutions shown in the table and records their absorbances in a 1.00 cm cuvette.
Concentration of dye (mM) | Measured absorbance
0.00 | 0.000
0.10 | 0.142
0.20 | 0.283
0.30 | 0.426
0.40 | 0.566
The student then measures the absorbance of an unknown sample of the same dye under identical conditions and obtains a value of 0.263.
(a) Sketch (no numerical grid required) the graph of absorbance versus concentration for the five standards and draw an appropriate best-fit straight line.
(b) Use the data to determine the numerical equation of the best-fit line in the form A=mc+b, where A is absorbance and c is concentration in mM.
(c) Using your equation from part (b), calculate the concentration of the dye in the unknown sample. Show all work and report the final concentration with the correct number of significant figures and units.