When NaCl forms, what yes, really happens is that $ceNa+$ and also $ceCl-$ come together and type an ionic bond and thus NaCl is formed and it is a rather exothermic reaction.

You are watching: Why is the formation of ionic compounds exothermic

Why and also from where is this power coming from? yes sir Ok, I review that every mechanism wants to minimize energy, however where accurate is this energy coming from, is it due to the fact that of some electrons or native the nucleus? Or from where?


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The negative standard enthalpy of development of salt chloride (i.e. ‘the development is exothermic’) is primarily due to the formation of a decision lattice. This decision lattice is a macroscopic setup of ion in a cubic fashion with each sodium ion surrounding by 6 chlorides and each chloride ion surrounding by 6 sodium ions.

If that were not for the generation the this lattice and also its inherent stabilising properties (a very great charge distribution, charges nicely alternate, contact between types of the same charge is strong inhibited) the formation of salt chloride would certainly be much much less exothermic.

Note most importantly, the it is not just the generation of sodium cations (that process is endothermic) or the generation that chloride anions (that procedure is only weakly exothermic) that reasons the as whole exothermicity the the entire reaction.


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answer Sep 15 "16 in ~ 9:46
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The prize is lattice energy.

The enthalpies involved in the development of ionic compounds have the right to be interpreted by Born-Haber cycle.

The complying with steps are affiliated in the formation of $ceNaCl$ because that example.

$$ce Na(s) -> Na(g) ag1$$

$$ceNa(g) -> Na+ + e- ag2$$

$$ce1/2 Cl2(g) -> Cl(g) ag3$$

$$ceCl(g) + e- -> Cl^-(g) ag4$$

$$ceNa+(g) +Cl^-(g) -> NaCl(s) ag5$$

You can see that power is compelled in the procedures 1-3 whereas energy is advanced in fourth and fifth steps.

The power evolved in the fifth step is called the lattice energy of the ionic compound and this only is responsible for the overall process being exothermic.

Now why lattice formation is exothermic? This is due to the fact that when a lattice is formed, brand-new attractive pressures are collection up that are dominant over the new repulsive forces collection up. Together it is known that attractive pressures decrease the potential power of a system(or increase the stability), so energy is released together heat.


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edited Sep 15 "16 at 16:22
reply Sep 15 "16 at 9:09
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Amritansh SinghalAmritansh Singhal
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Why and from whereby is this energy coming from?..

If we go much deeper it have the right to be described physically by the famous equation (energy massive equivalence) $ E = M C^2 $. So the energy originates from the fixed defect which gets converted come energy.( i hope you recognize what fixed defect is). Together we understand that energy released in a tasiilaq.net reaction is very small in comparison to a atom reactions, for this reason the fixed defect in tasiilaq.net reactions is likewise very tiny in comparison to nuclear reaction. Therefore in general we execute not take into factor to consider the fixed defect in a tasiilaq.net reaction(since it can be neglected) So us generally describe evolution of power on the communication of various other energies but all of these suggest again to power mass equivalence.


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reply Sep 18 "16 in ~ 0:34
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At the very first step in the formation of NaCl, the solid Na have to be converted to gaseous Na by the process sublimation so there comes sublimation entalpy, secondly the gas Na should shed one electron to come to be a Na+ ,so there comes the duty of ionisation entalpy and if we see the situation of chlorine molecule at first they must dissociate to 2 cl and also of electron affinity they should obtain an electron coming to be stable. At critical we need to bring both of them to an equilibrium place such that the released energy is sufficient for lock to do a shortcut (lattice energy) then in the same Na+and Cl-ions the electron and also the proton in the nucleus lure so some energy is again spend against that. Therefore while looking as whole we have the right to under that the process of formation of NaCl is an exothermic process


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answer Jul 17 "18 at 16:15
Archana RajendranArchana Rajendran
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