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

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Calcium chloride is crystalline in nature and also can it is in easily dissolved in water. It is hygroscopic in nature and also hence, provided in the desiccators for drying chemicals.

The melting and also boiling suggest of anhydrous calcium chloride is an extremely high. However, the melting allude of hexahydrate calcium chloride is only 29.9 °C. The molecular weight of that anhydrous type is 111 g/mol.

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

Ca(OH)2 + 2HCl —-> CaCl2 + 2H2O

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

Calcium chloride produces complimentary calcium ions i.e., the aqua complicated of calcium ion and chloride ion through dissolving us in water as follows

CaCl2 + 6H2O —–> 2+ + 2Cl

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

So, is CaCl2 Ionic or Covalent? CaCl2 is one ionic link owing come the large 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 also become cation whereas each chlorine atom gain one electron, donated through Calcium, and also get a negative charge.

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

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

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


Chemical Bond

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

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

A chemistry bond is created either by carrying electrons or by sharing electrons in between atoms the the molecule.

The chemistry bond is developed by the participation of just valence electrons, electrons of the outermost shell, that the atom.

There space two varieties of chemistry bonds based upon their formation.

Covalent shortcut Ionic Bond

Covalent Bond

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

Hence, a covalent bond may be polar or nonpolar.

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

Ionic Bond

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

As metals have low ionization energy and hence, they can conveniently transfer your electron to an additional atom. Nonmetals conveniently accept this electrons fan to your high electron acquire enthalpy or electron affinity.

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

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

How Ionic Bond development takes location in Calcium Chloride


The development of calcium chloride can be described by the Born Haber cycle.

Let us recognize the formation of calcium chloride in detail.

The calcium chloride compound is composed of one calcium atom and two chlorine atoms. As we recognize that the calcium atom belong to group 2 that the modern periodic table and hence, that is a metal.

Whereas the chlorine atom belong to group 17 of the modern-day periodic table and also therefore, the is a nonmetal.

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

As calcium is a white crystalline solid and hence, the very first step would certainly be the conversion of heavy calcium to gas calcium atom by giving sublimation energy (ΔHsub) because metals deserve to donate their electrons only in gas form.

Ca (s) + ΔHsub → Ca (g)

Ca (g) + (I.E.)1 → Ca+(g) + e-

Ca+(g) + (I.E.)2 → Ca2+ (g) + e

Usually, the 2nd ionization power is better than the first ionization energy. However, it is no true in the case of the calcium atom i.e., alkaline earth metals.

Let us explain this controversy.

The floor state digital configuration the the calcium atom is 4s2. Here, we need to carry out a big amount of energy for the extraction of one electron native the 4s subshell together it is a filled subshell.

After the remove of an electron, the electronic configuration the the unipositive calcium ion i do not care 4s1.

Now, that is basic to eliminate an electron by giving a tiny amount the energy because it will accomplish a stable noble has actually configuration i.e., the Argon atom.

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

The chlorine atom is a nonmetal and also hence, it has actually a high propensity to gain electrons owing to the 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 exists in diatomic kind i.e., Cl2. Therefore, the an initial step would certainly be the dissociation the chlorine elements into chlorine atoms and also the following step would certainly be accept 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 formation takes place between them by releasing energy. This energy is well-known as Lattice energy (U) and its value relies 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 do we obtain to understand that calcium chloride is one Ionic compound?


Differentiation in between Ionic and Covalent bond

The ionic and covalent bonds can be distinguished on the basis of the electronegativity distinction of the bond in between atoms.

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

How Calcium Chloride is an Ionic compound?

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

On Pauling Scale,

The electronegativity worth of the calcium atom = 1.0

The electronegativity worth 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 ~ above the Pauling scale, which is better than 2.0 and confirms the ionic nature that the Ca-Cl bond.

Hence, calcium chloride is one ionic compound.

Calcium chloride is extremely soluble in water fan to that ionic nature.

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

Uses that Calcium Chloride

Calcium chloride in water reduce the freezing point of water and hence, it stays clear of the development of ice and is offered for de-icing.A highly focused solution that calcium chloride on the road avoids the development of the dust owing to that is hygroscopic nature and forming a fluid layer on the surface ar of the road.


Here, us have questioned the ionic nature that calcium chloride.

In summary, calcium chloride is one ionic compound owing to the big electronegativity distinction of the Ca-Cl shortcut in calcium chloride, i m sorry is better than 2.0. The calcium atom forms a optimistic calcium ion by shedding two electrons and also the chlorine atom creates a negative chlorine ion by accepting one electron.

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