Question

3 pts D Question 5 After creating her standard curve for absorption versus the concentration (M) of FD&C Red 40, a student found that her best fit linear line for FD&C Red 40 was y = 2,774x + -0.009. Her Kool Aid sample had an absorbance of 0.848. If 0.465 grams of Kool Aid powder was used to prepare an 8-fl oz cup of her assigned flavor, what is the percent by mass of FD&C Red 40 in her 8-fl oz cup? Do not include the percentage sign in your answer. Pay attention to units. You are trying to find the mass percentage of red dye, so you need to know each variable in the equation in the manual. Note: These numbers are randomly generated, and will not be the same as your data in lab.

Answer 1

The best fit standard lineas equation ya 2 7792 +-0.0009 .... here, Now, putting to 0.848 a concentration to canation wel of FofcRed so get, у? А от 6 дие 0.848=2774 tonog .:23 0.848 - 8.000 9 3.05 x 20 m 2774 Der kool - Aid sample the concentration of Fofc Red wo is 3.058184 wow, , 2103 = 29.5795 m. .: 8 u v = 8 x 29.5735 = 236.588 al molas mans of FO &C Redro (Allura red) = 496.42 g/mol in der 8-hoz cap man of fotched yo present 3:05X/1 Yanol EX 236.588 mal x 4960422 = 0.036 . s. de Fof Redso Bresan beman- man of FDA Red no man of kool Aid Powder 100%. 0.036 x 100% - 4.25% 0.848 i Answer: 4.25 1000m