A researcher wants to determine the concentration of beta-carotene in carrots. She obtains a 0.776 M stock solution of beta-carotene and creates Dilution A by transferring 11.00 mL of stock solution into a new container and diluting it with solvent to a final volume of 98.00 mL. She creates Dilution B by transferring 47.00 mL of stock solution into a new container and diluting it with solvent to a final volume of 88.00 mL. She creates Dilution C by transferring 5.00 mL of Dilution Binto a new container and diluting it with solvent to a final volume of 22.00 mL. What is the concentration in mM of Dilution C? Report your answer with one place after the decimal.
Note: Remember to draw a dilution scheme!
Sally obtains a standard calibration curve for their assigned food dye by plotting absorbance versus concentration (in M) of known solutions and finds the following slope and intercept:
y = 1.904x + 0.022
Sally finds that her original Kool-aid sample is too concentrated, so they dilute it by transferring 3.00 mL of the original Kool-aid sample into a new container and diluting to a total volume of 48.00 mL. If the absorbance of the dilute Kool-aid sample at the appropriate wavelength for their assigned dye is 0.368, determine the concentration (in M) of the assigned food dye in the original Kool-aid sample. Report your answer with three places after the decimal.
After creating her standard curve for absorption versus the concentration (M) of FD&C Red 40 and processing her data, Sally found that her drinking strength Kool-Aid sample had an FD&C Red 40 concentration of 3.317 x 10–5 M. If 0.165 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 Kool-aid powder? Report your answer as a percentage with two places after the decimal.
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 Appendix B. Note that the percent by mass equation should be multiplied by 100. There may be some useful conversion factors in the experimental procedure.
Note: These numbers are randomly generated, and will not be the same as your data in lab.