A set of known concentrations of Red 40 dye solution was used to make a calibration plot of absorbance vs. concentration (in ppm). The slope of the best-fit line was 0.067 ppm –1. A 5.0 mL aliquot of strawberry soda was diluted to a final volume of 100 mL with deionized water. The absorbance measurement of the diluted soda solution was recorded as 0.67.

What is the linear equation for this experiment?

What is the concentration of Red 40 dye in the diluted soda solution?

 What is the concentration of Red 40 dye in the original strawberry soda?