University Chemistry ›› 2021, Vol. 36 ›› Issue (12): 2102008.doi: 10.3866/PKU.DXHX202102008

• Chemistry Laboratory • Previous Articles     Next Articles

Ammonium Carnallite Prepared from a Less-Solvent Solid State Reaction

Helong Jiang, Can Liu, Lixu Lei()   

  • Received:2021-02-03 Accepted:2021-03-15 Published:2021-04-08
  • Contact: Lixu Lei


Thermodynamics tells that solid state reactions will not stop until they complete, and will not be affected even when a small amount of solvent is used. Here, we report that solid MgCl2·6H2O and solid NH4Cl react to produce NH4Cl×MgCl2·6H2O in half an hour at room temperature, with the help of a little water that just submerges the solids. This experiment will introduce the concept of less solvent solid state reactions and their applications in green chemical processes, and it can also make the student know how to freeze a reaction to fit to the ex situ kinetic studies.

Key words: Magnesium chloride, Ammonium chloride, Ammonium magnesium chloride hexahydrate, Solid state reaction, Green chemical process