Precipitation

Precipitation reactions occur when cations and anions in aqueous solution combine to form an insoluble ionic solid called a precipitate.

For example, when a silver nitrate solution is poured into a sodium chloride solution, a chemical reaction occurs, producing a white silver chloride precipitate.

Wacky Science

CORRECTION 1: at, 10:36 it should say: 1 mol = 6.022 * 10^23 (not 10^-23)!

CORRECTION 2: 04:20 Generally, salts are formed when acids and bases neutralize. Metals and Nonmetals forming a salt is one possible option, not the general rule.