Catalan
metàtesi A chemical reaction between two compounds in which parts of each are interchanged to form two new compounds (AB+CD=AD+CB)
1
This enters into double decomposition with the salt, as shown in the first equation under the Solvay process.
2
Ammonium nitrate, NH4NO3, is prepared by neutralizing nitric acid with ammonia, or ammonium carbonate, or by double decomposition between potassium nitrate and ammonium sulphate.