Difference between charge and formal charge  [ENDORSED]


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AdamH02
Posts: 31
Joined: Mon Jun 17, 2019 7:23 am

Difference between charge and formal charge

Postby AdamH02 » Fri Jul 12, 2019 2:25 pm

An Hydrogen ion is said to have a charge of 1+, however in other molecules Oxygen for instance which is said to have a 2- charge but in a SO4 molecule it has a 1- charge. So what is the difference between these two?

Ethan McCarthy 1F
Posts: 31
Joined: Wed Feb 27, 2019 12:17 am

Re: Difference between charge and formal charge  [ENDORSED]

Postby Ethan McCarthy 1F » Mon Jul 15, 2019 12:23 am

Formal charge is the charge assoicated with each atom in a molecule, while the general charge you are referring to (the molecule's net charge) is the sum of all of the individual atoms' formal charge. In the case of [SO4], I believe the charge is 2-, which reflects an accurate sum of the formal charge of its atoms.

hannabarlow1A
Posts: 37
Joined: Mon Jun 17, 2019 7:23 am

Re: Difference between charge and formal charge

Postby hannabarlow1A » Tue Jul 16, 2019 8:09 am

The formal charge is assigned to each individual atom and is the difference between the valence electrons it normally possesses and the electrons it possesses in the molecule (from bonds or lone pairs). Each atom in a molecule will have a formal charge, and the sume of their formal charges will make up the charge of the whole molecule

David Zhang 1B
Posts: 48
Joined: Mon Jun 17, 2019 7:23 am

Re: Difference between charge and formal charge

Postby David Zhang 1B » Tue Jul 16, 2019 7:38 pm

Formal charge depends on the bonds and lone pairs assigned to each atom in a structure. It compares the charge in the atom, calculated by the number of bonds divided by 2 and the number of electrons in the lone pairs, to the normal number of valence electrons.

AdamH02
Posts: 31
Joined: Mon Jun 17, 2019 7:23 am

Re: Difference between charge and formal charge

Postby AdamH02 » Wed Jul 17, 2019 8:19 pm

Ok, cool. Thanks now it makes sense to me. I was confused before because I did not undertand the concept of net charge on a molecule.


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