3a. If the molar absorptivity constant for the red dye solution is 5.56Ã—104 M-1 cm-1 ,...

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Chemistry

3a. If the molar absorptivity constant for the red dye solutionis 5.56Ã—104 M-1 cm-1 , calculate the molarity of the red dyesolution with absorption = 0.900. You may assume L = 1.22cm. Hint:A=ÎµLC
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 Âµg of solute / L of solution (1Âµg = 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.

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3a If the molar absorptivity constant for the red dye solution is 556104 M1 cm1 calculate the molarity of the red dye solution with absorption 0900 You may assume L 122cm Hint ALC Solution Given data Pathlength L 122 cm 556104 M1 cm1 Absorbance A 0900 Molarity ALC Lets put the values in the formula 0900 556104 M1 cm1 122 cm C 0900 556104 M1 cm1 122 cm C 772104 M C Therefore the molarity of the Red dye 772104 M b Convert the molarity in part a to wv Show your work See Answer

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