CaCl2, described as calcium chloride, is a member that alkaline planet metal halides i.e., MX2, where, M is one alkaline earth metal. That is an not natural compound of white color without any type of odor.

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Calcium chloride is crystalline in nature and also can be easily liquified in water. The is hygroscopic in nature and also hence, used in the desiccators for drying chemicals.

The melting and also boiling suggest of anhydrous calcium chloride is very high. However, the melting suggest of hexahydrate calcium chloride is just 29.9 °C. The molecular weight of its anhydrous kind is 111 g/mol.

Generally, calcium chloride is discovered in the hydrated kind i.e., CaCl2 (H2O)n, wherein n = 0, 1, 2, 4, and also 6. Calcium chloride is all set by reaction the calcium hydroxide through hydrogen chloride.

Ca(OH)2 + 2HCl —-> CaCl2 + 2H2O

Calcium chloride can likewise be developed from limestone by the Solvay procedure i.e. CaCO3 + 2NaCl → CaCl2 + Na2CO3

Calcium chloride produces totally free calcium ion i.e., the aqua complicated of calcium ion and chloride ion by dissolving themselves in water as follows

CaCl2 + 6H2O —–> 2+ + 2Cl

This reaction outcomes in one appreciable boost in temperature i.e., exothermic reaction, and also hence, dissolution of calcium chloride in water has a high enthalpy of solvation.

So, is CaCl2 Ionic or Covalent? CaCl2 is one ionic link owing come the large electronegativity difference between the calcium atom and chlorine atom, i m sorry is better than 2.0.

In calcium chloride, the calcium atom donates its 2 electrons and also become cation whereas each chlorine atom gain one electron, donated by Calcium, and also get a negative charge.

Now, the calcium cation and the chlorine anions are attracted through the electrostatic pressure of attraction and hence, over there is the formation of one ionic bond between these 2 atoms.

Let us begin the discussion of the ionic nature the calcium chloride in depth.

Let us initiate this discussion with the basics of chemical bonds i.e., Ionic and Covalent Bond.


Chemical Bond

The chemistry bond is the force of attraction between the atom of the molecule, which brings atoms with each other in your chemical structure.

When an atom develops a chemistry bond, it often tends to achieve the nearest noble gas configuration.

A chemistry bond is formed either by transporting electrons or by sharing electrons in between atoms that the molecule.

The chemistry bond is formed by the joining of just valence electrons, electron of the outermost shell, that the atom.

There are two species of chemical bonds based upon their formation.

Covalent link Ionic Bond

Covalent Bond

The covalent link results when there is a share of electron pair between atoms that the molecule. However, this sharing may be same or unequal relying on the electronegativity that the constituent atom of the molecules.

Hence, a covalent bond might be polar or nonpolar.

In covalent bonding, the ionization power of the atom is really high the it cannot donate its electron or electron pair.

Ionic Bond

The ionic shortcut is the chemistry bond between metal and also nonmetal.

As metals have actually low ionization energy and hence, lock can quickly transfer their electron to an additional atom. Nonmetals quickly accept these electrons fan to their high electron gain enthalpy or electron affinity.

Hence, ionic link results once there is moving of electron (s) one of two people from one atom to one more atom or from metal to nonmetal.

As there is the formation of cations and also anion, there will certainly be the electrostatic pressure of attraction in between them.

How Ionic Bond development takes ar in Calcium Chloride


The formation of calcium chloride deserve to be described by the Born Haber cycle.

Let us know the formation of calcium chloride in detail.

The calcium chloride compound is composed of one calcium atom and two chlorine atoms. Together we understand that the calcium atom belongs to team 2 the the modern periodic table and hence, that is a metal.

Whereas the chlorine atom belong to group 17 that the modern periodic table and therefore, it is a nonmetal.

Metals have very low ionization energy (I.E.) and hence, the calcium atom will lose its electron easily. It is a two-step process i.e., loss of one electron per step.

As calcium is a white crystalline solid and hence, the an initial step would certainly be the conversion of heavy calcium to gaseous calcium atom by offering sublimation power (ΔHsub) since metals have the right to donate your electrons just in gaseous form.

Ca (s) + ΔHsub → Ca (g)

Ca (g) + (I.E.)1 → Ca+(g) + e-

Ca+(g) + (I.E.)2 → Ca2+ (g) + e

Usually, the second ionization energy is greater than the very first ionization energy. However, it is not true in the situation of the calcium atom i.e., alkaline planet metals.

Let us define this controversy.

The floor state electronic configuration the the calcium atom is 4s2. Here, we require to carry out a large amount of power for the extraction of one electron native the 4s subshell together it is a filled subshell.

After the remove of an electron, the digital configuration the the unipositive calcium ion becomes 4s1.

Now, it is straightforward to remove an electron by providing a tiny amount the energy due to the fact that it will achieve a secure noble has configuration i.e., the Argon atom.

Hence, the second ionization power of calcium is smaller than the first ionization energy

The chlorine atom is a nonmetal and hence, it has actually a high tendency to acquire electrons fan to its high electron affinity (E.A.) as compared to the calcium atom. Hence, the chlorine atom will certainly accept the electron donated through the calcium atom.

The chlorine atom exist in diatomic form i.e., Cl2. Therefore, the first step would be the dissociation the chlorine facets into chlorine atoms and the following step would be acceptance of electrons.

½ Cl2 (g) + ΔHdiss → Cl (g)

Cl (g) + e- → Cl-(g) + E.A.

Now, one calcium ion will combine with 2 chlorine ions, and hence, ionic bond development takes place between them by releasing energy. This energy is well-known as Lattice power (U) and its value depends upon the stamin of the Ionic bond.

Ca2+ (g) + 2Cl-(g) → CaCl2 (s) + U

The lattice energy (U) of the calcium chloride is -2195 kJ/mol.

How carry out we gain to understand that calcium chloride is an Ionic compound?


Differentiation in between Ionic and also Covalent bond

The ionic and covalent bonds can be differentiated on the communication of the electronegativity difference of the bond between atoms.

A chemistry bond is an Ionic bond if the electronegativity difference of the chemical bond is greater than 2.0 and also it will certainly be a covalent bond if the electronegativity difference is less than 2.0 ~ above the Pauling scale.

How Calcium Chloride is an Ionic compound?

In the situation of the calcium chloride link (CaCl2),

On Pauling Scale,

The electronegativity worth of the calcium atom = 1.0

The electronegativity value of the chlorine atom = 3.16

The electronegativity difference of the Ca-Cl bond = 2.16

The electronegativity distinction of the Ca-Cl shortcut in the calcium chloride compound is 2.16 top top the Pauling scale, i m sorry is higher than 2.0 and confirms the ionic nature that the Ca-Cl bond.

Hence, calcium chloride is one ionic compound.

Calcium chloride is highly soluble in water owing to that is ionic nature.

Anhydrous calcium chloride crystallizes in the orthorhombic and tetragonal structure whereas hexahydrate calcium chloride crystallizes chin in trigonal structure.

Uses that Calcium Chloride

Calcium chloride in water to reduce the freezing allude of water and hence, it avoids the formation of ice and is offered for de-icing.A highly concentrated solution of calcium chloride ~ above the road prevents the development of the dust fan to its hygroscopic nature and forming a fluid layer ~ above the surface ar of the road.


Here, us have discussed the ionic nature the calcium chloride.

In summary, calcium chloride is one ionic link owing come the big electronegativity difference of the Ca-Cl bond in calcium chloride, which is higher than 2.0. The calcium atom develops a confident calcium ion by losing two electrons and also the chlorine atom creates a negative chlorine ion by agree one electron.

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The calcium ion and also chlorine ion attract each various other via electrostatic pressure of attraction and an ionic bond formation takes place in between them by releasing power in the form of Lattice energy.