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17 Nov 2019
The colorimeter was used to measure the absorbance of each of a series of (FeSal)^+ solutions. A standard curve was constructed by plotting the absorbance vs. the concentration (M). The slope and y-intercept were found to be 1510 and 0.001, respectively. An aspirin sample was prepared, following the procedure given in the experiment: hydrolyzing 0.159 g of it with 5 ml, of 1 M NaOH (reaction 1), diluting this mixture to 50.00 mL (forming solution A, and taking a 1.00 mL aliquot of this solution and diluting it to 50.00 mL with 0.02 M Fe(III) (forming solution B - reaction 2). The absorbance of solution B was measured to be 0.380. DATA ANALYSIS step 3: Use the measured absorbance and the standard curve's slope and y-intercept to calculate the concentration of [FeSal]+ in solution B. How many moles of [FeSal)+ were in the 50.00 mL of solution B? How many moles of sodium salicylate were in the 1.00 mL aliquot of solution A used to prepare solution B? Given the number of moles of sodium salicylate in 1.00 mL of solution A (calculated above), how many moles are in the 50.00 mL of solution A? Based upon the number of moles of sodium salicylate calculated in part, how many moles of acetylsalicy1ic acid, C_9H_8O_4, were in the aspirin sample? Use mass of the aspirin sample (given in the procedure section above) and the answer to part, converted to calculate the mass percent of acetylsalicylic acid, C_9H_8O_4, in the aspirin sample.
The colorimeter was used to measure the absorbance of each of a series of (FeSal)^+ solutions. A standard curve was constructed by plotting the absorbance vs. the concentration (M). The slope and y-intercept were found to be 1510 and 0.001, respectively. An aspirin sample was prepared, following the procedure given in the experiment: hydrolyzing 0.159 g of it with 5 ml, of 1 M NaOH (reaction 1), diluting this mixture to 50.00 mL (forming solution A, and taking a 1.00 mL aliquot of this solution and diluting it to 50.00 mL with 0.02 M Fe(III) (forming solution B - reaction 2). The absorbance of solution B was measured to be 0.380. DATA ANALYSIS step 3: Use the measured absorbance and the standard curve's slope and y-intercept to calculate the concentration of [FeSal]+ in solution B. How many moles of [FeSal)+ were in the 50.00 mL of solution B? How many moles of sodium salicylate were in the 1.00 mL aliquot of solution A used to prepare solution B? Given the number of moles of sodium salicylate in 1.00 mL of solution A (calculated above), how many moles are in the 50.00 mL of solution A? Based upon the number of moles of sodium salicylate calculated in part, how many moles of acetylsalicy1ic acid, C_9H_8O_4, were in the aspirin sample? Use mass of the aspirin sample (given in the procedure section above) and the answer to part, converted to calculate the mass percent of acetylsalicylic acid, C_9H_8O_4, in the aspirin sample.
Trinidad TremblayLv2
17 Nov 2019