Which statement about the spectrophotometric analysis of red 40 dye is true?
select one:
a. the intensity of the color of the solution is indirectly proportional to concentration of the red 40 dye.
b. the calibration plot is a graph of concentration of red 40 dye (y-axis) versus absorbance (x-axis).
c. absorbance = slope x concentration.
d. if there is no red 40 dye present in the solution, the absorbance will be one.