Question:5 A sample made up of solvent only (and reactants other than the compou
ID: 890548 • Letter: Q
Question
Question:5
A sample made up of solvent only (and reactants other than the compound of interest, if any) is called a blank. If the blank has a measurable absorbance, then the curve has a non-zero y-intercept. The equation for the absorbance of a solution as a function of concentration then becomes: A = (m · c) + b
Calculate the concentration of a solution with an absorbance of 0.43. When the concentration is in percent, by volume, the slope is 3.20 x 10-2 and the y-intercept is 0.28. Show your work.
Explanation / Answer
A = (m · c) + b
0.43 = ( 3.2 x 10-2 x C) + 0.28
( 3.2 x 10-2 x C) = 0.43 / 0.28
( 3.2 x 10-2 x C) = 1.54
C= 1.54 / 0.032 = 48.125
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