charge

Moderators: Chem_Mod, Chem_Admin

RBergtraun_3A
Posts: 41
Joined: Wed Feb 20, 2019 12:15 am

charge

Postby RBergtraun_3A » Fri Dec 06, 2019 6:49 pm

Why is the charge on Sulfate 2-?

Bryce Barbee
Posts: 103
Joined: Wed Sep 18, 2019 12:20 am

Re: charge

Postby Bryce Barbee » Fri Dec 06, 2019 6:54 pm

It is because there are 2 double bonds on the Sulfur and the two single bonded oxygens have a negative 1 charge.

Tiffany Vo 3G
Posts: 52
Joined: Sat Aug 17, 2019 12:17 am

Re: charge

Postby Tiffany Vo 3G » Sat Dec 07, 2019 12:27 am

The charge is 2- because you calculate the formal charge on each atom. For the single bonded oxygens, the formal charge is -1 because you take the valence electrons and subtract the lone pairs and half the bonding pairs, 6-(6 + .5(2)). The double bonded oxygens have a formal charge of 0, 6-(4 + .5(4)). The sulfur atom has a formal charge of zero as well because 6 -(0 + .5(12)). Thus, the overall charge is (-1) + (-1) + (0) + (0) + (0) = -2.

RBergtraun_3A
Posts: 41
Joined: Wed Feb 20, 2019 12:15 am

Re: charge

Postby RBergtraun_3A » Sat Dec 07, 2019 12:56 pm

Bryce Barbee wrote:It is because there are 2 double bonds on the Sulfur and the two single bonded oxygens have a negative 1 charge.

This took me a sec but makes sense thanks

RBergtraun_3A
Posts: 41
Joined: Wed Feb 20, 2019 12:15 am

Re: charge

Postby RBergtraun_3A » Sat Dec 07, 2019 2:49 pm

Tiffany Vo 3G wrote:The charge is 2- because you calculate the formal charge on each atom. For the single bonded oxygens, the formal charge is -1 because you take the valence electrons and subtract the lone pairs and half the bonding pairs, 6-(6 + .5(2)). The double bonded oxygens have a formal charge of 0, 6-(4 + .5(4)). The sulfur atom has a formal charge of zero as well because 6 -(0 + .5(12)). Thus, the overall charge is (-1) + (-1) + (0) + (0) + (0) = -2.

Very clear thank you.


Return to “Empirical & Molecular Formulas”

Who is online

Users browsing this forum: No registered users and 1 guest