1. The particular fat molecules shown in the introduction contains one long chain fatty acid derived from palmitic acid (formula:"C15H31CO"), and two long chain fatty acid derived from stearic acid (formula:"C17H35CO") and the derivative of glycerol (formula: C3H5O3). What is the total formula of this fat molecule? What is its formula mass? Is there reason to think that fat or soap molecules do not like small molecules such as acetic acid, Ch3COOH?
2. Explain in words and draw a molecular picture of what happened when oil was mixed with soapy water. Why did the oily droplets disappear?
3. An aspirin sample, 0.35 grams, was titrated with 21 mL of 0.122 M NaOH. How many moles of aspirin are actually present.
a. If the molar mass of aspirin= 180.15 g/mol, how many moles of aspirin are present in a 0.35 gram sample (assuming it is pure).
b. What is the percent purity of the titrated aspirin sample?