Deriving the cooridinate numbers of both ions in rock salt

In summary, the conversation discusses deriving the coordinate numbers of ions in rock salt and accounting for differences in lattice enthalpy between LiCl, NaCl, LiF, and MgO. The poster is asked to show their own effort before receiving help. The poster also shares their knowledge that coordinate number is the number of atoms surrounding an atom in a solid state lattice and speculates on the impact of electronegativity differences on lattice energy.
  • #1
rastamanrm
2
0
How would I go about deriving the cooridinate numbers of both ions in rock salt, and,
how could I account for the differences in lattice enthalpy between the following;


LiCl (861 kJ/mole) - NaCl (787)
LiCl - LiF (1046)
LiCl - MgO (3850)

Cheers.
 
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  • #2
rasta,

We can not help until you first show us what effort you have made. Please read the posting guidelines (see "Rules" on top of page).
 
  • #3
Gokul43201 said:
rasta,

We can not help until you first show us what effort you have made. Please read the posting guidelines (see "Rules" on top of page).

Well I do know that a coordinate number is the number of atoms surrounding an atom in a solid state lattice

And for the second bit, I assume LiCl would have a larger lattice energy due to the greater difference in electronegativity of both consituents, similar with the next one. Not sure about the last one.
 

FAQ: Deriving the cooridinate numbers of both ions in rock salt

1. What is rock salt and why is it important to determine the coordinate numbers of ions in it?

Rock salt is a mineral composed of sodium chloride (NaCl) and is commonly used for cooking and de-icing roads. It is important to determine the coordinate numbers of ions in rock salt because it provides information about the arrangement and bonding between the ions, which in turn affects the physical and chemical properties of the substance.

2. How do you derive the coordinate numbers of ions in rock salt?

The coordinate numbers of ions in rock salt can be derived through X-ray diffraction analysis, which involves measuring the angles and intensities of the X-rays scattered by the crystal lattice of the substance. This data can then be used to calculate the distances between the ions and determine their coordination numbers.

3. What is the significance of knowing the coordinate numbers of ions in rock salt?

Knowing the coordinate numbers of ions in rock salt can provide insight into the crystal structure and bonding of the substance, which can have implications for its properties such as solubility, melting point, and electrical conductivity. It also allows us to better understand and manipulate the substance for various applications.

4. Can the coordinate numbers of ions in rock salt vary?

Yes, the coordinate numbers of ions in rock salt can vary depending on the conditions under which the substance was formed. For example, the temperature and pressure during crystallization can affect the arrangement of ions and therefore the coordination numbers. Changes in the chemical environment can also lead to variations in the coordination numbers.

5. What other methods can be used to determine the coordinate numbers of ions in rock salt?

Aside from X-ray diffraction analysis, other methods such as neutron diffraction, electron diffraction, and spectroscopic techniques can also be used to determine the coordinate numbers of ions in rock salt. Each method has its own advantages and limitations, and the choice of method will depend on the specific research question and available resources.

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