Indicate whether each statement is true or false:

(a) The higher the temperature, the more soluble most gases are in water.

(b) The higher the temperature, the more soluble most ionic solids are in water.
(c) As you cool a saturated solution from high temperature to low temperature, solids start to crystallize out of solution if you achieve a supersaturated solution.
(d) If you take a saturated solution and raise its temperature, you can (usually) add more solute and make the solution even more concentrated.