A researcher wants to determine the concentration of beta-carotene in carrots. She obtains a 0.689 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 91.00 mL. She creates Dilution B by transferring 51.00 mL of stock solution into a new container and diluting it with solvent to a final volume of 99.00 mL. She creates Dilution C by transferring 7.00 mL of Dilution B into a new container and diluting it with solvent to a final volume of 20.00 mL. She measures the absorbance of each solution and obtains the values below. Plot the data in a spreadsheet software and determine the best-fit line. What is the slope of the best-fit line? Report your answer with three places after the decimal. Solution Absorbance Stock solution 0.981 Dilution A 0.229 Dilution B 0.47 Dilution C 0.287
A researcher wants to determine the concentration of beta-carotene in carrots. She obtains a 0.689 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 91.00 mL. She creates Dilution B by transferring 51.00 mL of stock solution into a new container and diluting it with solvent to a final volume of 99.00 mL. She creates Dilution C by transferring 7.00 mL of Dilution B into a new container and diluting it with solvent to a final volume of 20.00 mL. She measures the absorbance of each solution and obtains the values below. Plot the data in a spreadsheet software and determine the best-fit line. What is the slope of the best-fit line? Report your answer with three places after the decimal. Solution Absorbance Stock solution 0.981 Dilution A 0.229 Dilution B 0.47 Dilution C 0.287
Principles of Modern Chemistry
8th Edition
ISBN:9781305079113
Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Chapter15: Acid–base Equilibria
Section: Chapter Questions
Problem 98AP
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A researcher wants to determine the concentration of beta-carotene in carrots. She obtains a 0.689 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 91.00 mL. She creates Dilution B by transferring 51.00 mL of stock solution into a new container and diluting it with solvent to a final volume of 99.00 mL. She creates Dilution C by transferring 7.00 mL of Dilution B into a new container and diluting it with solvent to a final volume of 20.00 mL. She measures the absorbance of each solution and obtains the values below. Plot the data in a spreadsheet software and determine the best-fit line. What is the slope of the best-fit line? Report your answer with three places after the decimal.
| Solution | Absorbance |
| Stock solution | 0.981 |
| Dilution A | 0.229 |
| Dilution B | 0.47 |
| Dilution C | 0.287 |
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