# Difference between revisions of "User:Moira M. Esson/Notebook/CHEM-571/2013/09/03"

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## Objectives

1. Prepare adenosine solutions of various concentrations to determine the molar absorptivity of adenosine.
2. Prepare inosine solutions of various concentrations to determine the molar absorptivity of inosine.
3. Prepare calibration curves for adenosine and inosine.

## Preparation of Adenosine Stock solution

• Note: To ensure the full addition of all of the adenosine, a small amount of deionized H2O was placed on the weigh boat and a pipette was used to remove all of the H2O on the weigh boat.s
2. Cap the volumetric flask and shake the volumetric flask vigorously until the adenosine is completely dissolved.
• Note:The solution should be shaken vigorously for a minimum of 5 minutes.
3. Pour the solution into a 50mL falcon tube for later storage.
4. Dilute the solution by taking the necessary volume of the solution (using an automated pipette), placing the solution into the appropriately sized volumetric flask, and add deionized H2O.

• Stock Solution Preparation for Adenosine
 Total Mass [g] Stock Volume [mL] Concentration [M] 0.2006 50 0.015

• Serial Dilution of Adenosine Stock Solution
 Dilution 'M1'[mol/L] 'V1' [mL] 'M2'[mol/L] 'V2' [mL] 1 0.015 0.1 1.5E-4 10 2 0.015 0.25 3.0E-5 10 3 1.5E-4 1.667 2.5E-5 10 4 1.5E-4 1.333 2.0E-5 10 5 1.5E-4 1.0 1.5E-5 10 6 1.5E-4 0.667 1.0E-5 10 7 1.5E-4 0.333 0.5E-5 10 8 1.5E-4 0.5 0.75E-5 10

## Notes

• Originally the adenosine stock solution was prepared