The synthesis of aspirin is a common esterification reaction. It is based on the balanced reaction given in the background of this lab. Calculate the theoretical yield of aspirin given that 3.52-mL of acetic anhydride was reacted with 0.9457-g of salicylic acid. Synthesized solids often need to be purified prior to use. What are some ways you could purify synthesized aspirin in the laboratory? Explain why you would not expect to smell acetic acid after the addition of sodium bicarbonate to the esterification reaction mixture.

Hydrogen peroxide decomposes as shown below: 2 H2O2 → 2 H2O + O2 molar mass H2O2 = (34.0 g/mol)   A sample of hydrogen peroxide solution was analyzed using the procedure from the “Enzymatic Decomposition and Analysis of Hydrogen Peroxide” experiment. A 5.89 g sample of the solution generated 0.0237 mol of oxygen gas.   Calculate the grams of H2O2 in the solution.

Mg + 2HCl → MgCl2 + H2 This experiment was performed two times. All values are valid to one decimal place. If the decimal place is not shown, add a ".0" Experiment Mass of Mg (mg) Starting Temperature (°C) Final Temperature (°C) 1 2 19.6 20.7 19.5 20.7 33 33.5 The previous page contained data from two experimental runs for the reaction between magnesium and hydrochloric acid. Mg+ 2HC! MgCl2 + H2 First, how many moles (n) of Mg reacted with the HCI? Use the average value of the two masses from your provided data set. Answer: 0.001658 I Mg + 2HCI MgCl2 + H2 Next, what is the amount of heat absorbed by the water (qsurr) in the experiment? Use the average AT from your data to calculate a single value for q. Report your answer in J. Remember to consult the lab manual and/or the video for any values you might need. Answer: Mg + 2HC! MgCl2 + H2 Finally, calculate A,H for this reaction and report your answer in kJ/mol. Answer:

Hydrogen peroxide decomposes as shown below: 2 H2O2 → 2 H2O + O2 molar mass H2O2 = (34.0 g/mol)   A sample of hydrogen peroxide solution was analyzed using the procedure from the “Enzymatic Decomposition and Analysis of Hydrogen Peroxide” experiment. A 7.54 g sample of the solution generated 0.0277 mol of oxygen gas.   Calculate the mass percent of H2O2 in the solution.