Mass of pure acelylsalicylic acid used to prepare the 250 mL pure aspirin stock

Question

Mass of pure acelylsalicylic acid used to prepare the 250 mL pure aspirin stock standard solution and the concentration (mg/mL) of this solution. Concentration (mg/mL) and absorbance for each of the four standard acelylsalicylic acid solutions prepared Volume and absorbance for each of the three "unknown" aspirin tablet solutions prepared. Beer's Law plot and equation for the line (calculated using Excel). Concentration of each "unknown" aspirin tablet solution determined using the Beer's Law plot. Calculated mass of acetylsalicylic acid in the tablet for each "unknown" aspirin tablet solution prepared.

Explanation / Answer

Given A= 6.005* concentration +0.0017

Concentration = (A-0.0017)/6.005

Table

Absorbance                       concentration (mg/ml)                       mass ( mg/ml)*250ml                   

0.555                               (0.555-0.0017)/6.005=0.092                   0 .092*250 = 23 mg

0.346                                (0.346-0.0017)/6.005= .057                      0 .057*250= 14.25 mg

0.205                                (0.246-0.0017)/6.005= 0.041                   0.041*250 = 10.25 mg

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