11/5 ch3 review

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11/5 ch3 review

Postby SantanaRodriguezDis1G » Sun Nov 05, 2017 7:47 pm

In the review session one of the examples was [HC2O4]^-1
I do not understand why the h atom attaches to an O atom instead of the C. Could someone please explain why ?

Nancy Dinh 2J
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Re: 11/5 ch3 review

Postby Nancy Dinh 2J » Sun Nov 05, 2017 9:30 pm

I think it was because O is more electronegative than C, and therefore H is more attracted to O than to C.

Also, if H were to bond with one of the C, then that C atom cannot form any double bonds with O. When you try to calculate the formal charges, you'll see that this molecule will yield a net charge of -2 instead of the -1 that you want.

Ramya Natarajan 1D
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Re: 11/5 ch3 review

Postby Ramya Natarajan 1D » Wed Nov 08, 2017 12:01 am

A good thing to remember is that when you have extra Hydrogens or when the molecular formula is expanded like that (as it is in most organic formulas), hydrogen will often not be bonded to a central atom but one of the peripheral atoms like Oxygen.

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