3a. If the molar absorptivity constant for the red dye solutionis 5.56×104 M-1 cm-1 , calculate the molarity of the red dyesolution with absorption = 0.900. You may assume L = 1.22cm. Hint:A=εLC
b. Convert the molarity in part a to w/v%. Show your work. Molarmass of FD&C red #3 = 879.86g/mol w/v% is defined as weight (ingrams) of solute/100 mL of solution You should remember that w/v%always refers to the grams of materials in 100mL of solution. ppmis defined as mg of solute/ L of solution (1mg = 10-3 g) ppb isdefined as µg of solute / L of solution (1µg = 10-6 g)
c. If you want to dilute the red dye solution in part a by 5times in a single dilution step, explain in two sentences on howone should proceed with the dilution. In addition, what is thefinal concentration of the diluted solution? Show your work for thenumerical part of this question. You are only allowed to use a 5-mLvolumetric pipet, a 10-mL volumetric pipet, a 50-mL volumetricflask and/or a 100-mL volumetric flask during the dilution. You mayNOT reuse the same pipet during the dilution.
