If the solid does not dissolve in a given solvent at room temperature, heat the test
tube containing the mixture in a beaker of water heated on a hot plate. If the solid
completely dissolves at elevated temperature, record that it is soluble in the hot solvent.
If some but not all dissolves, record that it is slightly soluble, and continue to add drops
of solvent until dissolution is complete. Once the substance has been dissolved in hot
solvent, allow the solution to cool to room temperature, then stick the test tube in ice. If
necessary, induce crystallization by rubbing the walls of the tube with a stirring rod.
Describe the nature of the crystals that form (for example, needles, plates or blocks).
If the solid remains undissolved even at elevated temperature, simply record it to be
insoluble in both the hot and cold solvent.