2. A student is following a procedure described in his module, used water as the solvent and encountered some interesting problems. Comment on the effect if any, each of the following situations could have had on the experimental results.

a) The unknown, a white powder, failed to dissolve. b) The student returned to the laboratory instructor for a different solid unknown. This unknown dissolved, but bubbles were seen escaping from the solution almost immediately after the addition of the solid. c) As the student was setting up the apparatus to measure the freezing point of the unknown solution, the thermometer assembly rolled off the lab bench, and the thermometer broke. The student observed a new thermometer and performed the experiment as instructed.