Illustrate born-haber cycle, Chemistry

Assignment Help:

Q. Illustrate Born-Haber cycle?

Boron is always covalent and does not   form,B3+ ions, because' the energy required to remove three electrons is very high.  Many simple compounds of A1 and Ga like AlCl3 and GaCl3 are also covalent when anhydrous. However, in solution, the large amount of hydration energy evolved compensates the high ionisation energy and all the' metal ions exist in a hydrated state.

This can be explained with the help of Born-Haber cycle as given below. However, this is a simplified approach given only on the bas; of enthalpy changes, whereas the direction and extent of any reaction depend on the free energy changes which take into account changes both in enthalpy and entropy.

365_Illustrate Born-Haber cycle.png

Thus, despite the large ionisation energies of aluminium, the enthalpy of' solution of  AlCl3 has a large negative value. Therefore, in aqueous solution, AIC3 exists as AI3+(aq) and Cl-(aq). It might be thought that the same argument would apply to BCI3; But to make the enthalpy of solution of BCl3 nethalpy the enthalpy of hydration of B3+ should be - 6009 KJ which is unlikely for the small B3+cation. Therefore, BC13 hydrolyses in aqueous solution to give boric acid and not B3+ (aq).

BCl3 + 3H20 -----------------------------------> H3B03 + 3HCI


Related Discussions:- Illustrate born-haber cycle

Cengage online, There are three assignments due on the 25th I can''t give t...

There are three assignments due on the 25th I can''t give the questions because it is online

How many atomic number does have ne, How many atomic number does have Ne ...

How many atomic number does have Ne Because Ne has atomic number = 10 and F has atomic number = 9, the neon species that has 9 electrons is Ne+

What are backwashing and disinfection, Water treatment system among other p...

Water treatment system among other process will contain the following and you are required to design only one of them and demonstrate strong understanding of the principles involv

Vsper theory, #quest defination ,description prostulates

#quest defination ,description prostulates

How we can arrange the basic strength of amines?, The given amines are CH3...

The given amines are CH3NH2, (CH3)2NH,NH3,NH2Br.  The amines list is from strongest base to weakest . (CH3)2NH  CH3NH2.

Explain about optical isomerism, Q. Explain about Optical Isomerism? O...

Q. Explain about Optical Isomerism? Optical Isomerism: -Two isomers which have almost identical physical and chemical properties like mp. B p. density. Colour etc.. But diffe

Acetone react with (i)mg/h2o (ii)h2so4, This is an example of pinacone pina...

This is an example of pinacone pinacone rearrangemnt acetone with Mg and H2O forms 2,3 Dimethylbutane2.3 diol which on reacting with H+ from forms first a carbocation on carbon 2

Basic radical analysis, why original solution is prepared during basic radi...

why original solution is prepared during basic radical analysis

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd