## Strengths of Acids

Katrina Jang 2H
Posts: 21
Joined: Fri Sep 25, 2015 3:00 am

### Strengths of Acids

What is the relationship between structure or hybridization and acidity?

Destiny Dare 1D
Posts: 21
Joined: Fri Sep 25, 2015 3:00 am

### Re: Strengths of Acids

The greater the s-character of a hybrid orbital, the greater the acidity of the acid. So an acid with $sp^{2}$ hybridization will be stronger than an acid with $sp^{3}$ hybridization, and an acid with $sp$ hybridization will be stronger than an acid with $sp^{2}$ hybridization.

chemgal4L
Posts: 19
Joined: Fri Sep 25, 2015 3:00 am

### Re: Strengths of Acids

Is there a conceptual reason behind this? I understand the rule that with a greater s orbital, the higher acidity of the acid, but why is this exactly?

Destiny Dare 1D
Posts: 21
Joined: Fri Sep 25, 2015 3:00 am

### Re: Strengths of Acids

S-orbitals are closer to the nucleus than p-orbitals. So the more s-character a hybrid orbital has, the closer the electrons are to the atom. Such atoms are less willing to share their electron density (have greater electronegativity), and thus have greater acidic character.