Question

Prelab: Analysis for iron content of a vitamin Answers can only be entered/graded between 2019-11-01 and 2019-11-06 You have been given a jar of red fruit punch and been asked to determine the concentration of red dye in the fruit punch. You obtain a stock solution of this red dye and it has a concentration of 0.00220 M in the lab room, the stock solution is found in the hood). You take 10.0 mL of this stock solution and dilute it to 100.0 mL. You call this your standard solution. Using a colorimeter, you determine that the red dye standard absorbs green light (the complementary color) with an absorbance value of 0.71. Complete Table 1 with information regarding the standard solution Table 1: Analysis of Standard Standard Concentration of red dye in stock soln (M) (B) Absorbance of your standard solution Concentration of your standard solution (M) Ratio of absorbance/conc. of standard

Answer 1

1. Concentration of red dye in stock 101"= 0.00220 (M2 Absorbance of standard roln= 0.71 where Now, Weing MiVi= Me ve Mi = Initial Malarity = 0.00220 M - Vi= Initial Volume 10.0 ml M2 = Final Molarity = ? V₂ = final Volume = 100.0 mL o Conc of standard solution = Me = M, Vi # = 0.00220 M X to:omb = 0.00022013 100.0 mL ie Conc of standard solh (M) = 0.000 220 Ratio of Absorbance conc. of standard = 0.71_= 3227.27 0.000 220