Please help with the postlab discussion, the first 3 questions only. POSTLAB DIS
ID: 533739 • Letter: P
Question
Please help with the postlab discussion, the first 3 questions only.
POSTLAB DISCUSSION-SPECTROPHOTOMETRY OF ASPIRIN This form should be filled out using PEN only. Mistakes should be crossed through with a single line only. Note: all calculations must be shown in lab notebook pages to receive credit SUMMARY OF ASPIRIN (ASA) TABLET ANALYSIS Brand of ASA Advertised Mass ASA Per Tablet Mass of ASA Mass of of ASA Tablet (from (g) Tablet (g Per Tablet analysis) 1. How does your experimental value for the mass of aspirin compare to the value advertised on the bottle? Be sure to quantify any difference, do not give vague relative statements, such as "it's way off" or "fairly close," etc. 2. How would your calibration curve be affected if you had failed to quantitatively transfer all of the standard (pure) ASA into solution before making the curve? What effect would this have on the final calculated result for the mass of ASA in your tablet? Be specific about the direction of error. 3. Explain why a standard calibration curve with several data points was used, rather than a single data point only, to calculate the concentration of ASA in your tablet? (In other words, why does this yield more reliable data?) Identify at least two specific reasons.Explanation / Answer
1)
For the Bayer brand, the difference in mass compared to the advertised value is (0.325-0.177)/0.325 *100%= 45.54%.
Therefore, the mass of aspirin is less than the advertised value by 45.54%.
For the Kroger brand, the difference in mass compared to the advertised value is (0.388-0.325)/0.325 * 100%= 19.38%.
Thus, the actual mass of aspirin is more than the advertised value by 19.38%.