Part A. Solubility of Solid Compounds
Place about 40 mg (0.040 g) of biphenyl into each of two dry test tubes. (Don't try to be exact: you can be 1-2 mg off and the experiment will still work.) Label the test tubes and then add 1 mL of water to the 1st tube and 1 mL of hexane to the 2nd tube. Determine the solubility of each sample in the following way. Using the rounded end of a spatula, stir each sample continuously for 60 seconds by twirling the spatula rapidly. After 60 seconds (do not stir longer), note whether the compound is soluble (dissolves completely) or insoluble (none of it dissolves). If all but a couple granules have dissolved, then you should state that the sample is soluble. Record these results in the following table. Now repeat the directions given above for with malonic acid. Record these results.