Lead Chloride Solubility, Demo #31

Using "Texas-size" test tubes, you can show what happens when solutions of lead (II) and chloride are mixed so that the ion product is greater than K_sp or less than K_sp.  You can also illustrate the effect of adding extra chloride ion to a saturated solution of lead chloride.

Lime Water-Carbon Dioxide, Demo #33

The addition of carbon dioxide gas to limewater (aqueous calcium hydroxide) first results in the precipitation of calcium carbonate.  Additional carbon dioxide, however, redissolves the precipitate.  The reaction can be reversed to give the calcium carbonate precipitate once again either by boiling the solution or bubbling air through it.