Calculate the concentration of a solution with an absorbance of 1.275 (A). The slope is 0.0184 (A)/% and the Y intercept is 0.037 (A). Show your work.

Question

A sample is made up of a solvent only (and reactants other than the compound of interest, if any) is called a blank. If the blank has a measurable absorbance, the the curve has a non-zero y-intercept. The equation for the absorbance of a solution as a function of a concentration then becomes: A=(m * c) +b.

Answer 1

Plugging the given values into the equation A=(m*c)+b gives 1.25A=(0.0184A/% * c)+0.037A.

 

Simplify by subtracting the intercept, 0,037A from both sides to get 1.213A = 0.0184A/%*c

 

Then divide both sides by the slope, 0.0184A/% to get 65.9% = c