The term for a solid that forms when two solutions are mixed is a precipitate. Precipitation reactions occur when two soluble compounds are mixed and a solid product forms. The solid product is called the precipitate. The precipitation reaction is a type of chemical reaction in which the reactants are in a liquid state and the product is in a solid state. An example of a precipitation reaction is the reaction of silver nitrate and hydrochloric acid. When these two solutions are mixed, the silver ions from the silver nitrate and the chloride ions from the hydrochloric acid combine to form a solid silver chloride precipitate.