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![[Post New]](/templates/default/images/icon_minipost_new.gif) 5 Feb 2008 00:51:05 IST
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Why CH3oh is more acidic than HOH?
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5 Feb 2008 11:18:27 IST
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due to inductive effect
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lighten up the darkness............
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5 Feb 2008 12:50:25 IST
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Why hav U posted this ques again?
U wanted a theoritical and conceptual ans and I posted it in ur previous post on the first page. I think U didn't see it.
I am posting it again, if U hav any doubt in this reason, feel free to ask me-
When U luk at the Pka values, CH3OH is more acidic than H2O.
Many of U hav given +I effect as the reason but its not true becoz +I effect wud INCREASE BASICITY NOT ACIDITY.
Although alcohols are less acidic than water but this exception can be explained only in one way-
See, in CH3OH, First of all the C-O bond is polar and secondly due to +I effect of CH3, the polarity of the bond increases, and in comparison to this, the OH-H bond is less polar as H has no inductive effect.
So CH3-OH, being polar breaks out easily thus giving H, and hence is more acidic.
See, the acidity diff is very less. The Pka of water=15.7 and that of CH3OH=15.5, so the diff is very less. They are almost equally acidic, but still the explanation can be the one given by me.
Hope U got it.
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5 Feb 2008 14:48:48 IST
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are bhai tarin if u can apply this polarity concept to methanol then why cant u apply this polarity concept to ethanol. In case we apply to ethanol we get ethanol more acidic than water which is false.
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5 Feb 2008 16:27:42 IST
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Arre bhai snippy,
See, I gav the Pka values to show that the diff in acidity of water and methanol is very very less.
R group has +I effect, which tends to decrease acidity. This +I effect is there in both methanol as well as higher alcohols.
Now U cant defy experimental observations and U also need a theoritical and conceptual ans to those observations. So the only way to explain the more acidity of methanol is the polarity of the bond.
In higher alcohols, the R group is larger, hence more +I effect and this +I effect overshadows the polarity effect and hence they are less acidic than water.
Hope U got it.
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The quality of a person's life is in direct proportion to their commitment to excellence, regardless of their chosen field of endeavor.
It is during our darkest moments that we must focus to see the light.
Check out my blog at:
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Some myths about Chemical Engineering.
(A must see for every student)
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