What is water of crystallisation?

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SUMMARY

The discussion centers on the concept of water of crystallisation, specifically its role in crystal lattices and as a ligand. Participants explore whether water molecules are trapped within the crystal lattice or act as ligands, noting that both scenarios are possible. The conversation highlights that the specific ratio of water molecules in metal salts, such as lithium, is due to the presence of defined vacancies in the crystal lattice. Additionally, the deliquescent nature of certain salts, particularly lithium salts, is addressed, indicating their unique interactions with water.

PREREQUISITES
  • Understanding of crystal lattice structures
  • Knowledge of ligand theory in coordination chemistry
  • Familiarity with metal salts and their properties
  • Basic concepts of deliquescence in chemistry
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  • Research the role of water as a ligand in coordination compounds
  • Study the properties of lithium salts and their deliquescent behavior
  • Explore the significance of vacancies in crystal lattices
  • Investigate the differences in water of crystallisation among various metal salts
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Chemistry students, researchers in materials science, and professionals studying the properties of metal salts and their interactions with water.

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Does the water molecule act as a ligand or is it trapped in the crystal lattice somehow?

If it is trapped in the crystal lattice then why it is found in a specific ratio? And why some metal salts like lithium form water of crystallisation more than other metal salts?
 
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jd12345 said:
Does the water molecule act as a ligand or is it trapped in the crystal lattice somehow?

Both scenarios possible.

If it is trapped in the crystal lattice then why it is found in a specific ratio?

Crystal lattice contains well defined number of right sized vacancies that water molecule can fit in.
 
Okay, i suppose the d-block elements mostly have water of crystallisaiton as ligands, right? And others like alkali metals in their crystal lattice?

Also what makes some salts like Lithium salts so deliquescent?
 

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