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Topic: what is the shape of OH2-?  (Read 4175 times)

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Offline bb

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what is the shape of OH2-?
« on: September 30, 2009, 09:50:27 PM »
i have no idea.. plzz help? is it bent?

Offline nj_bartel

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Re: what is the shape of OH2-?
« Reply #1 on: September 30, 2009, 11:14:54 PM »
Sounds like an impossible structure to me

Offline cth

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Re: what is the shape of OH2-?
« Reply #2 on: October 01, 2009, 07:55:52 AM »
I did a small Hartree-Fock computation on H2O and H2O-.

For H2O: O-H distance is 0,95Å and H-O-H angle 105,5 (compare with measured distance 0,9584Å and angle 104,45)
For H2O-: O-H distance is 1,03Å and H-O-H angle 99,9

The extra electron goes into an anti-bonding orbital which push the two hydrogen atoms closer to one another. Not surprisingly, this anion is not stable.

Offline sjb

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Re: what is the shape of OH2-?
« Reply #3 on: October 01, 2009, 08:01:09 AM »
i have no idea.. plzz help? is it bent?

Do you mean OH2- (water, with an additional electron)? or OH2- (hydroxide, also with an addtional electron)? How many atoms are there in your ion?

Offline cth

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Re: what is the shape of OH2-?
« Reply #4 on: October 01, 2009, 11:33:35 AM »
Yes, the title is confusing but I guess he meant H2O-.

There is no sense to ask the geometry and angle of a diatomic compound which would necessarily be linear.

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