Metathesis Reaction
Definition and meaning of Metathesis Reaction in chemistry.
A metathesis reaction is a chemical reaction in which two ionic compounds exchange ions or groups to form two new compounds. Also called a double displacement reaction, these reactions are driven by the formation of a product that is effectively removed from the reaction environment.
In more detail
In a metathesis reaction, the cations and anions of reactants swap partners to form new compounds. The reaction occurs when the products include substances removed from solution, such as an insoluble precipitate, a gas that escapes, water in acid-base neutralizations, or a weak electrolyte that remains largely undissociated. This fundamental reaction type appears across analytical chemistry, environmental chemistry, and many laboratory syntheses.
Key facts
| Field | General Chemistry |
|---|---|
| Also called | double displacement reaction |
| General form | AB + CD → AD + CB |
| Driving forces | insoluble precipitate, gas, water, or weak electrolyte formation |
When aqueous solutions of silver nitrate and sodium chloride are mixed, a white precipitate of silver chloride forms: AgNO3(aq) + NaCl(aq) → AgCl(s) + NaNO3(aq). Silver chloride is insoluble and precipitates out, driving the reaction forward.
Frequently asked questions
What drives a metathesis reaction to occur?
A metathesis reaction proceeds when the products include substances removed from solution, such as insoluble precipitates, gases, or water. This removal shifts the equilibrium toward products and makes the reverse reaction unfavorable.
How does a metathesis reaction differ from a redox reaction?
Metathesis reactions involve the exchange of ions without electron transfer between species. Redox reactions fundamentally depend on the transfer of electrons and oxidation state changes.