a. The chemical structures below show two analgesics (painkillers): acetaminophen and ibuprofen. Which analgesic would you expect to be more soluble in water at pH 7? Explain your answer by naming the intermolecular forces present in each molecule. CH3 CH3 LOH CH3 OH CH3 Acetaminophen Ibuprofen b. Imagine you wanted to increase acetaminophen's solubility in water. To what approximate pH would you adjust your solution of acetaminophen? What about if you wanted to increase the solubility of ibuprofen? Think about the pka's of the functional groups in each molecule.

1. Listed below are solubility-vs.-temperature data for an organic substance A dis- solved in water. Temperature (°C) Solubility of A in 100 mL of Water (g) 1.5 20 3.0 40 6.5 60 11.0 80 17.0 a. Graph the solubility of A vs. temperature. Use the data given in the table. Connect the data points with a smooth curve. b. Suppose 0.1 g of A and 1.0 mL of water were mixed and heated to 80°C. Would all of substance A dissolve? c. The solution prepared in (b) is cooled. At what temperature will crystals of А appear? d. Suppose the cooling described in (c) were continued to 0°C. How many grams of A would come out of solution? Explain how you obtained your answer.

When 2.43 g of a certain molecular compound X are dissolved in 65. g of formamide (NH₂COH), the freezing point of the solution is measured to be -0.4 °C. Calculate the molar mass of X. If you need any additional information on formamide, use only what you find in the ALEKS Data resource. Also, be sure your answer has a unit symbol, and is rounded to 2 significant digits.

When 1.13 g of a certain molecular compound X are dissolved in 75.0 g of formamide NH2COH , the freezing point of the solution is measured to be 0.6°C . Calculate the molar mass of X. If you need any additional information on formamide, use only what you find in the ALEKS Data resource. Also, be sure your answer has a unit symbol, and is rounded to 2 significant digit.