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Relative Acidity Concept Question

Posted: Wed Dec 06, 2017 9:31 pm
by Grace Lee 3G
If an atom has a higher electronegativity, is it a stronger acid?

Re: Relative Acidity Concept Question

Posted: Thu Dec 07, 2017 12:00 am
by skalvakota2H
Atoms with higher electronegativity will be less inclined to share its electrons with a proton. Thus, increasing electronegativity of an atom will decrease basicity, and weaker bases have stronger conjugate acids.

Another way to think about this is that with increasing electronegativity, the H-A bond in the acid becomes more polar and demonstrate more ionic character; this implies that the proton in HA will be lost and the proton is more readily lost only when the acid is strong.

Re: Relative Acidity Concept Question

Posted: Thu Dec 07, 2017 12:54 pm
by Clara Hu 1G
In the example given in class, hypochlorous acid was the most acidic out of HClO, HBrO, and HIO because CL has the highest electronegativity which stabilizes the negatively charged O by withdrawing electron density.

Re: Relative Acidity Concept Question

Posted: Fri Dec 08, 2017 4:56 pm
by Kyle Alves 3K
electronegativity can also be seen as in making the conjugate base more stable and therefore showing it is a stronger acid. For example:
between HIO and HIO3, HIO3 is a stronger acid with a more stable conjugate base as the e- charge is more equally dispersed between 3 Os than one O. The more dispersed, the more stable the atom, the more stable the conjugate base= the stronger an acid.

Re: Relative Acidity Concept Question

Posted: Fri Dec 08, 2017 5:05 pm
by Kyle Alves 3K
Probably a simpler example because the last one is confusing:
between HCl and HBr, Cl is more electronegative so pulls in e- greater, making the bond stronger
therefore, HBr would e a stronger acid as it is less stable with its longer bond length