Homework Question

(Polar molecules, Non-polar molecules, etc.)

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Homework Question

Postby 805377003 » Fri Nov 20, 2020 12:29 pm

What is the molecular shape of sulfite ion?
Can someone explain this?

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Re: Homework Question

Postby Chem_Mod » Fri Nov 20, 2020 12:33 pm

Sulfur is the central atom with 3 oxygens bonded to it (1 double bond and 2 single bonds). When counting electrons, one electron pair remains. Because sulfur can have an expanded octet, it takes the electron pair giving it an AX3E or trigonal pyramidal geometry.

Mikayla James 2A
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Re: Homework Question

Postby Mikayla James 2A » Fri Nov 20, 2020 12:35 pm

Hi! The molecular shape of a sulfite ion is trigonal pyramidal because it has 4 regions of electron density (3 bonding pairs and 1 lone pair) and follows the AX3E VSEPR notation. The four pairs are arranged tetrahedrally, but because only atom positions are used to name the shape of a molecule, the molecular shape is trigonal pyramidal. Hope this helps!

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