Preparation
Equilibrium: Solubility

Name:

Section:

1. This experiment.
2. The appropriate or assigned sections of your textbook.

1. When a solid is added to cold water in a beaker and the mixture is stirred, the outside of the beaker warms.
   • The process described is (1) endothermic, (2) exothermic, (3) neither endo- nor exothermic.
   • The algebraic sign of DH^o_sol of the solid is (1) positive, (2) negative, (3) zero.
   • As temperature increases, the solubility of the solid in water (1) increases, (2) decreases, (3) remains the same
2. A WPI freshman, Ray Dium, makes up 15.7 mL of a solution containing 5.00 g NaCl. On cooling the solution, he observes that crystals begin to form at 0.0 ^oC. Calculate the (a) solubility of NaCl in g/mL, (b) solubility of NaCl in moles/L, (c) value of K_sp for NaCl, all at 0.0 ^oC.