Double replacement
From Sciencemadness Wiki
This article is a stub. Please help Sciencemadness Wiki by expanding it, adding pictures, and improving existing text.
|
A double replacement or double displacement is a reaction where two cations exchange anions or vice versa.
These reactions are usually in equilibrium; they proceed to completion in the following cases:
- One of the resulting products is insoluble and precipitates (e.g. barium sulfate);
- One of the resulting products is a poorly dissociated, mostly molecular compound (e.g. water);
- One of the resulting products is volatile and is distilled off the mixture (e.g. nitric acid);
- One of the resulting products is unstable and decomposes into non-ionic products such as gases and water (e.g. carbonic acid);