my textbook claims that electrovalent and polar covalent compound dissolve in electrovalent compounds and also polar covalent compounds yet not in non-polar covalent compounds. I recognize the reason for this. It is due to the fact that the oppositely fee moeities that the 2 compounds entice each other and also the compounds therefore dissociate and ionize into ions thus resulting in dissolution.

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Now, it additionally says the non-polar covalent link dissolve in non-polar covalent compounds but not in electrovalent and also polar covalent compounds. I do not quite recognize the factor behind this.

I would prefer to understand what dissolved is at the molecule level and also why non-polar covalent compound dissolve in non-polar covalent compounds only?


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There is the oft quoted adage in tasiilaq.net, which goes something like:

like dissolves like

The reason for this can be interpreted on the communication of polar/ionic compounds have actually some degree of charge separation. In polar solvents, the partial charges on on the solvent molecule can connect with the partial dues on the solute molecules. These interactions lower the as whole energy of the system, and thus dissolution bring away place. This part you get, for this reason it\"s fine.

First let\"s resolve why non-polar solutes don\"t dissolve in polar solvents. Consider the straightforward case, the a long chain hydrocarbon (solute) in water (solvent, current in bigger excess). Typically, water molecules will form (and break) hydrogen bonds with each other. At any given time, a water molecule would choose to maximise the variety of hydrogen bond it can form, simply due to the fact that it is energetically favourable.

Remember that the water molecule, cannot type hydrogen bonds through the hydrophobic molecule; it deserve to only perform so with other water molecules.

See more: What Is The Greatest Common Factor Of 18 And 35, Greatest Common Factor (Gcf) Of 18 And 35

So when a hydrophobic is reduce in an aqueous medium, hydrogen bonds in between water molecules will certainly be damaged to do room for the hydrophobe; however, water molecules perform not react with hydrophobe. This is poor energetically. So, water molecules would certainly now try to embrace an arrangement that maximises the hydrogen bonding network; to perform so they will arrange us in a \"cage\" choose structure surrounding the hydrocarbon droplet. While, this allows the water to make much more hydrogen bonds, it leader to overral \"ordering\" and also thus decreases entropy. Again, bad. Thus to minimise this hydrocarbon droplets will certainly clump together, and will it is in exluded by the solvent--this is why oil and also water don\"t mix. (Read more here)

So what happens when non-polar compounds space tossed into non-polar solvents. True, there aren\"t any type of dipole-dipole, ion-dipole, etcetera kinds of communication that you have actually with polar molecules, however you still have actually something dubbed London dispersion, and also non-polar reality often connect via this weak interactions.