April 21, 2014

Homework Help: Determination of ASA Content of Tablets Lab Report

Posted by Lena on Wednesday, December 5, 2012 at 12:14am.

Not asking for answers necesarily but I would to know how to approach each question
Mass of pure acetylsalicylic acid (ASA) : .508 g

Dilution Absorbance (a.u.)
2:11 .116
4:11 .259
6:11 .392
8:11 .502
10:11 .548

Mass of tablet : .380 g
Absorbance read on the Spec 20 : .314 a.u.
Concentration of the solution : 5.42e-4 M

Using reverse dilution, calculate the concentration of the tablet in the 100 mL diluted solution.


Calculate the number of moles in the 100 mL diluted solution.


Calculate the mass (g) in the 100mL diluted solution.


Determine the mass of ASA in 250 mL.


Determine the % of ASA in the tablet.

Determine the number of grains of ASA.

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