HSAB theory

The HSAB concept is an initialism for "hard and soft (Lewis) acids and bases". Also known as the Pearson acid base concept, HSAB is widely used in chemistry for explaining stability of compounds, reaction mechanisms and pathways. It assigns the terms 'hard' or 'soft', and 'acid' or 'base' to chemical species. 'Hard' applies to species which are small, have high charge states (the charge criterion applies mainly to acids, to a lesser extent to bases), and are weakly polarizable. 'Soft' applies to species which are big, have low charge states and are strongly polarizable. The concept is a way of applying the notion of orbital overlap to specific chemical cases.

The theory is used in contexts where a qualitative, rather than quantitative, description would help in understanding the predominant factors which drive chemical properties and reactions. This is especially so in transition metal chemistry, where numerous experiments have been done to determine the relative ordering of ligands and transition metal ions in terms of their hardness and softness.

Podcasts:

PLAYLIST TIME:

'Diskathing

by: Subb

You may not care but don't be naive
Well take The best The positive aspect
Have some friends and a punkska band
I guess that's The key to your sobriety
Even if you're a pervert use your head
Before you date this girl, you better sure you've bled
It's o.k. you'll do some mistakes
Like Ace Ventura with Snowflakes
Ohhhhhhhhhhhhhh!
Life is like diskathing
And someday you'll have a lovely wife
You'll do like O.J. and kill her with a knife
You'll obey to your bastard dog
Live across The street from a big fat slob
You will be a fucking statistic
Another man without a diploma
But after all you'll be happy
Cause you know man, this is The key
[Chorus]
[Bridge]
[Solo]
Ba-ba-ba, ba-Barbara ann!!! [x3]
[Chorus]




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