CaCl2, described as calcium chloride, is a member of alkaline earth steel halides i.e., MX2, where, M is an alkaline earth steel. It is an inorganic compound of white shade without any kind of odor.

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Calcium chloride is crystalline in nature and have the right to be quickly liquified in water. It is hygroscopic in nature and thus, offered in the desiccators for drying chemicals.

The melting and also boiling point of anhydrous calcium chloride is exceptionally high. However before, the melting suggest of hexahydprice calcium chloride is only 29.9 °C. The molecular weight of its anhydrous develop is 111 g/mol.

Generally, calcium chloride is discovered in the hydrated form i.e., CaCl2 (H2O)n, where n = 0, 1, 2, 4, and 6. Calcium chloride is all set by reactivity of calcium hydroxide through hydrogen chloride.

Ca(OH)2 + 2HCl —-> CaCl2 + 2H2O

Calcium chloride have the right to likewise be produced from limerock by the Solvay procedure i.e. CaCO3 + 2NaCl → CaCl2 + Na2CO3

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

CaCl2 + 6H2O —–> 2+ + 2Cl

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

So, is CaCl2 Ionic or Covalent? CaCl2 is an ionic compound owing to the big electronegativity difference in between the calcium atom and also chlorine atom, which is greater than 2.0.

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

Now, the calcium cation and also the chlorine anions are attracted by the electrostatic pressure of attractivity and also therefore, there is the formation of an ionic bond in between these 2 atoms.

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

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


Chemical Bond

The chemical bond is the force of attraction in between the atoms of the molecule, which brings atoms together in their chemical structure.

When an atom creates a chemical bond, it often tends to accomplish the nearemainder noble gas configuration.

A chemical bond is formed either by delivering electrons or by sharing electrons in between atoms of the molecule.

The chemical bond is developed by the participation of only valence electrons, electrons of the outera lot of shell, of the atom.

Tright here are 2 forms of chemical bonds based upon their formation.

Covalent Bond Ionic Bond

Covalent Bond

The covalent bond results once there is a sharing of electron pair between atoms of the molecule. However, this sharing may be equal or unequal depending upon the electronegativity of the constituent atoms of the molecules.

Hence, a covalent bond might be polar or nonpolar.

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

Ionic Bond

The ionic bond is the chemical bond in between steel and also nonmetal.

As steels have low ionization power and for this reason, they can easily transfer their electron to an additional atom. Nonsteels quickly accept these electrons owing to their high electron get enthalpy or electron affinity.

Hence, ionic bond outcomes once tright here is transferring of electron (s) either from one atom to one more atom or from metal to nonmetal.

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

How Ionic Bond formation takes location in Calcium Chloride


The development of calcium chloride have the right to be defined by the Born Haber cycle.

Let us understand the formation of calcium chloride in detail.

The calcium chloride compound is composed of one calcium atom and also 2 chlorine atoms. As we understand that the calcium atom belongs to group 2 of the contemporary routine table and also therefore, it is a steel.

Whereas the chlorine atom belongs to group 17 of the modern regular table and also therefore, it is a nonsteel.

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

As calcium is a white crystalline solid and thus, the first action would be the conversion of solid calcium to gaseous calcium atom by offering sublimation power (ΔHsub) bereason metals can donate their 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

Typically, the second ionization energy is better than the first ionization energy. However before, it is not true in the instance of the calcium atom i.e., alkaline earth steels.

Let us define this conflict.

The ground state electronic configuration of the calcium atom is 4s2. Here, we have to administer a huge amount of power for the extractivity of an electron from the 4s subshell as it is a filled subshell.

After the removal of an electron, the electronic configuration of the unipositive calcium ion becomes 4s1.

Now, it is straightforward to rerelocate an electron by offering a tiny amount of energy bereason it will accomplish a secure noble has configuration i.e., the Argon atom.

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

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

The chlorine atom exists in diatomic form i.e., Cl2. As such, the initially action would be the dissociation of chlorine aspects right into chlorine atoms and the following step would certainly be acceptance of electrons.

½ Cl2 (g) + ΔHdiss → Cl (g)

Cl (g) + e- → Cl-(g) + E.A.

Now, one calcium ion will combine via 2 chlorine ions, and hence, ionic bond formation takes location between them by releasing energy. This power is recognized as Lattice Energy (U) and its value depends upon the toughness of the Ionic bond.

Ca2+ (g) + 2Cl-(g) → CaCl2 (s) + U

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

How perform we obtain to recognize 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 basis of the electronegativity distinction of the bond between atoms.

A chemical bond is an Ionic bond if the electronegativity distinction of the chemical bond is better than 2.0 and it will be a covalent bond if the electronegativity difference is less than 2.0 on the Pauling scale.

How Calcium Chloride is an Ionic compound?

In the instance of the calcium chloride compound (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 difference of the Ca-Cl bond in the calcium chloride compound is 2.16 on the Pauling scale, which is better than 2.0 and also confirms the ionic nature of the Ca-Cl bond.

Hence, calcium chloride is an ionic compound.

Calcium chloride is extremely soluble in water owing to its ionic nature.

Anhydrous calcium chloride crystallizes in the orthorhombic and also tetragonal framework whereas hexahydprice calcium chloride crystallizes itself in trigonal framework.

Uses of Calcium Chloride

Calcium chloride in water decreases the freezing allude of water and also hence, it avoids the formation of ice and is provided for de-icing.A extremely focused solution of calcium chloride on the road avoids the formation of the dust owing to its hygroscopic nature and also developing a liquid layer on the surface of the road.


Here, we have questioned the ionic nature of calcium chloride.

In summary, calcium chloride is an ionic compound owing to the large electronegativity distinction of the Ca-Cl bond in calcium chloride, which is higher than 2.0. The calcium atom forms a positive calcium ion by losing 2 electrons and the chlorine atom develops a negative chlorine ion by accepting one electron.

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