Question

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The spectrophotometer was used to measure the abosrbance of each of a series of [FeSal]+ solutions. A standard curve was constructed by plotting the absorbance vs. concentration (M). The slope and y-intercept were found to be 1493 M-1 and 0.005, respectively.

An aspirin sample was prepared following the procedure given in the experiment. A 0.139 g sample of aspirin was hydrolyzed with 5 mL of 1 M NaOH (reaction 1) and diluted with distilled water to 50.00 mL in a 50 mL volumetric flask, forming solution A. A 1.00 mL aliquot of solution A was diluted to 50.00 mL using 0.02 M Fe(III), forming solution B (reaction 2) The absorbance of solution B was found to be 0.396.

1.) Use the measured absorbance and the standard curve's slope and y-intercept to calculate the concentration of [FeSal]+ in solution B.

2.) How many moles of [FeSal]+ were in the 50.00 mL of solution B?

3.)How many moles of sodium salicylate were in the 1.00 mL aliquot used to prepare solution B?

4.) Given the number of moles of sodium salicylate in 1.00 mL of solution A (calculated in c), how many moles are in the 50.00 mL of solution A?

5.) Based upon the number of moles of sodium salicylate calculated in part (d), how many moles of acetylsalicylic acid,

C

9

H

8

O

4

,

C

9

H

8

O

4

,

were in the aspirin sample?

6.) Use the mass of the aspirin sample (given in the Procedure section above) and the answer to part (e) converted to grams to calculate the mass percent of acetylsalicylic acid,

C

9

H

8

O

4

,

C

9

H

8

O

4

,

in the aspirin sample.

Answer 1