1. One tablet of Brand Y aspirin was dissolved in 10 mL of 1.0 M NaOH, boiled, and then diluted to a final volume of 100 mL with deionized water. A 2.5 mL aliquot of this concentrated aspirin solution was diluted to a final volume of 100 mL with FeCl3. A calibration plot of absorbance vs. concentration was obtained, with the slope of the best fit straight line as 1370 M^-1. The diluted aspirin solution had an absorbance of 0.932. What is the concentration of the dilute aspirin? a. What is the concentration of the aspirin in the dilute aspirin solution? b. What is the concentration of the original aspirin solution? c. How many milligrams of aspirin are present in one tablet of Brand Y aspirin? 2. The absorbance of dilute aspirin solution (diluted with FeCl3) generates an error--too concentrated. After showing your TA that you cannot determine the absorbance of the solution, the TA tells you to make a new solution dilute aspirin solution. When making a new solution, should it be more concentrated or less concentrated?
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