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I'm not an expert teacher or lecturer of chemistry. I was only a student from SMA NEGERI 15 SURABAYA who had been one of the Bronze Medalist Participants of Olimpiade Sains Nasional X (2011) of Chemistry In Manado, North Sulawesi, 11 - 16 September 2011 and graduated in 2012. Now, I'm studying at Universitas Airlangga in Surabaya, Indonesia. I do love chemistry and I would like to help them who had difficulties in studying chemistry. That's why, please understand me if you found some misconcepts in my entries. Suggestions are always necessary in order to develop this blog. And I'm sorry because my English isn't so well.

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The Documents

Wednesday, December 21, 2011

Like Dissolves Like, Why?

First, see the picture below:

(Source: http://www.science.uwaterloo.ca/~cchieh/cact/fig/interaction.gif)

The picture above shows us types of intermolecular interaction between particles. The weakest intermolecular interaction is dispersion (London Force) interaction. and the strongest intermolecular interaction is ion - dipole interaction. But what is the relation between intermolecular interaction and our topic now?

We have to remember this: Mostly, solubility of compounds depends on the intermolecular interaction. This is the important key why most non polar compounds soluble in non polar solvent and vice versa. I got a question from my friend: Why does it happen? Why does non polar compounds like Oil are hard to be diluted into water? Meanwhile, we know that the induced dipole - dipole interaction is stronger than dispersion interaction?

Many salts dissolve in water because the strong ion - dipole attractions that water molecules form with the ions are very similar to the strong attractions between the ions themselves and, therefore, can soluble for them. The same salts are insoluble in non polar solvent like hexane because the weak ion - induced dipole forces their ions could form with the non polar molecules of this solvent cannot substitute for attractions between the ions. See the picture below:


Further Reading. . .
Silberberg. Chemistry, The Molecular Nature of Matter and Change, Fifth Edition.


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