Thursday, September 28, 2006

Random ramblings about chemistry:

The longest compound sentences are probably not found in GP scripts, but in chemistry scripts. I really only learn to write very very long sentences in chemistry with a variety of conjunctions, like: As, because, thus, hence, therefore, such that, and, moreover, then, additionally, however, but, also, due to, while.

Just a weird thing that came up in my mind.

"When trifluoroethanoic acid dissociates, it forms a carboxylate anion which has its negative charge spread over the two highly electronegative oxygen atoms and is stabilised by resonance. In addition, trifluoroethanoic acid has three highly electronegative and hence electron-withdrawing fluorine atoms attached to it. As such, the negative charge on the carboxylate group of the trifluoroethanoic acid anion is further dispersed by the fluorine atoms that draw the negative charge towards itself. Thus, the deprotonated trifluoroethanoic acid is highly stable.

While ethanoic acid anion also has its negative charge dispersed over two highly electronegative oxygen atoms and is also stabilised by resonance, the additional stabilising effect of nearby electron-withdrawing groups by charge dispersal due to the inductive effect is absent in the ethanoic acid anion. Thus, the deprotonated ethanoic acid is less stable than the deprotoned trifluroethanoic acid anion, and hence trifluoroethanoic acid is a stronger acid than ethanoic acid.

Should the author's conclusion be accepted? Explain your answer."

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