Precipitation reaction

Definition

A precipitation reaction occurs when two aqueous solutions react to form an insoluble solid, known as the precipitate. This type of reaction is a double displacement reaction where the ions in solution exchange partners.

5 Must Know Facts For Your Next Test

1. Precipitation reactions involve the formation of an insoluble product from soluble reactants.
2. The general form of a precipitation reaction is AB(aq) + CD(aq) -> AD(s) + CB(aq).
3. Solubility rules help predict whether a precipitate will form in a given reaction.
4. Precipitates can be identified by their characteristic colors and physical properties.
5. These reactions are commonly used in qualitative analysis to identify the presence of specific ions.

Review Questions

• What is formed during a precipitation reaction?
• How can you predict if a precipitate will form in a given chemical reaction?
• Why are solubility rules important for understanding precipitation reactions?

Related terms

Double Displacement Reaction: A type of chemical reaction where two compounds exchange ions to form two new compounds, often resulting in the formation of a precipitate.

Solubility Rules:

Guidelines that help predict whether an ionic compound will dissolve in water or form a precipitate.

Aqueous Solution: A solution where water is the solvent and substances are dissolved to form ions or molecules uniformly distributed within it.