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Aspirin Analysis # 24

Aspirin Analysis # 24. What are we doing today. We are going to use a spec. 20 to determine the absorbance of our tablet. Once we know the absorbance we can determine the strength of our aspirin . Remember use the equation of line.

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Aspirin Analysis # 24

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  1. Aspirin Analysis# 24

  2. What are we doing today • We are going to use a spec. 20 to determine the absorbance of our tablet. • Once we know the absorbance we can determine the strength of our aspirin. • Remember use the equation of line. • To help determine the absorbance, we complex the aspirin.

  3. Procedures • Obtain, wash, and dry with acetone a mortar and pestle • Obtain and accurately determine the mass of a aspirin tablet. • Grind up your aspirin and place it in a 125 mL. Erlenmeyer flask. • Add 10 Ml. Of 1. M NaOH and about 70 mL. Di. H2O • Place the flask on a hot plate and warm the solution while • swirling. • Warm the solution until it boils. • Rinse the flask down with Di. water • Filter the solution into a 250mL. round bottom flask. • Mix very thoroughly.

  4. Procedures Continued • Pipette 1 mL. of your solution into a 25mL. graduated cylinder. • Add 0.020M IronIIIChloride solution and fill to the 20mL. line. • Mix thoroughly • Follow procedures on spec. 20 to determine absorbance.

  5. Table 24-1 Calibration Graph Data Remember .898 actually means .898 X10-4

  6. Lou Tisone Chem116-30 Fall-06

  7. Due Next Week • Two graphs #1 absorbance Vs. M x104 from the data I gave you • # 2Abs Vs. Mg./ Tablet you must calculate • Do two trials ( two different tablets) • Complete table 24-2 • Answer questions 2-4

  8. Lou Tisone Chem116-30 Fall-06

  9. Help with table 24.1 Convert from Molarity to mg/tablet Ex #1 .898X10-4 You must do the same for the rest of the data so you can make the second graph

  10. Table 24.2 Trial # 1 Mass of my aspirin is .370grams, and abs = .482 from my calibration graph # 1 y = 0.1759X-0.0015 Don’t forget X10-4 the actual answer = 2.76X10-4 M

  11. Mg Aspirin / Tablet table 24.2 Percent Aspirin / Tablet Weight of entire tablet = 0.370g or 370mg

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