When NaCl creates, what really happens is that $ceNa+$ and also $ceCl-$ come together and create an ionic bond and thus NaCl is developed and also it is a fairly exothermic reaction.

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

Why and also from wbelow is this energy coming from? Ok Ok, I check out that eincredibly mechanism wants to alleviate energy, but where literally is this power coming from, is it bereason of some electrons or from the nucleus? Or from where?


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Why and from where is this power coming from?..

If we go much deeper it have the right to be explained physically by the famous equation (power mass equivalence) $ E = M C^2 $. So the power comes from the mass defect which gets converted to energy.( I hope you know what mass defect is). As we know that power released in a chemical reactivity is very tiny in comparikid to a nuclear reactions, so the mass defect in chemical reactions is additionally exceptionally little in compariboy to nuclear reactivity. So in general we perform not take right into consideration the mass defect in a chemical reaction(given that it can be neglected) So we mainly explain evolution of energy on the basis of various other energies but every one of these suggest aacquire to power mass equivalence.


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answered Sep 18 "16 at 0:34
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JM97JM97
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The negative standard enthalpy of formation of sodium chloride (i.e. ‘the development is exothermic’) is mainly due to the development of a crystal lattice. This crystal lattice is a macroscopic arrangement of ions in a cubic fashion with each sodium ion surrounded by 6 chlorides and also each chloride ion surrounded by 6 sodium ions.

If it were not for the generation of this lattice and also its inherent stabilising properties (an extremely good charge distribution, charges nicely alternative, call in between species of identical charge is strongly inhibited) the formation of sodium chloride would be a lot much less exothermic.

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


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answered Sep 15 "16 at 9:46
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JanJan
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The answer is lattice energy.

The enthalpies associated in the formation of ionic compounds can be construed by Born-Haber cycle.

The complying with actions are connected in the development of $ceNaCl$ for 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 have the right to view that power is forced in the steps 1-3 whereas energy is evolved in 4th and also fifth procedures.

The power advanced in the fifth action is referred to as the lattice power of the ionic compound and this just is responsible for the all at once process being exothermic.

Now why lattice formation is exothermic? This is because when a lattice is developed, new attrenergetic forces are erected that are leading over the new repulsive pressures erected. As it is known that attrenergetic forces decrease the potential power of a system(or rise the stability), so power is released as warm.


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edited Sep 15 "16 at 16:22
answered Sep 15 "16 at 9:09
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Amritansh SinghalAmritansh Singhal
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At the initially action in the formation of NaCl, the solid Na should be converted to gaseous Na by the process sublimation so tright here comes sublimation entalpy, secondly the gaseous Na should lose one electron to become a Na+ ,so there comes the role of ionisation entalpy and also if we see the instance of chlorine molecule at initially they must dissociate to 2 cl and also of electron affinity they have to acquire an electron ending up being secure. At last we must bring both of them to an equilibrium position such that the released energy is sufficient for them to make a bond (lattice energy) then in the exact same Na+and Cl-ions the electron and the proloads in the nucleus tempt so some energy is aacquire spend versus that. Therefore while looking in its entirety we have the right to under that the process of formation of NaCl is an exothermic process


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