2014 Midterm question 7. Structure of HCLO3

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Sen Gao 4L
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Joined: Fri Sep 26, 2014 2:02 pm

2014 Midterm question 7. Structure of HCLO3

Postby Sen Gao 4L » Sun Nov 23, 2014 7:52 pm

This question asks for the structure of HCLO3, chloric acid.

If I try to draw the structure using formal charge rules, I can end up writing CL double bonded with 3 O atoms, and single bonded to a H atom. I know this is the wrong structure.

The correct structure calls for the H to be bonded to an O atom instead. How can I figure this out if I have no prior knowledge of the correct structure of chloric acid?

K Honeychurch 1K
Posts: 27
Joined: Fri Sep 26, 2014 2:02 pm

Re: 2014 Midterm question 7. Structure of HCLO3

Postby K Honeychurch 1K » Sun Nov 23, 2014 8:32 pm

Most acids have an -OH branching off of them. I think that is the only clue that would give you the right structure.

Sen Gao 4L
Posts: 9
Joined: Fri Sep 26, 2014 2:02 pm

Re: 2014 Midterm question 7. Structure of HCLO3

Postby Sen Gao 4L » Mon Nov 24, 2014 3:59 pm

I see, thank you very much.

Also, does this mean that this acid would also have different resonance forms since the H can be bonded to the different O atoms? Or is this not an example of resonance?

K Honeychurch 1K
Posts: 27
Joined: Fri Sep 26, 2014 2:02 pm

Re: 2014 Midterm question 7. Structure of HCLO3

Postby K Honeychurch 1K » Tue Nov 25, 2014 5:25 pm

No, we only consider resonance when we are dealing with electrons because electrons are free to move around to the different atoms. The hydrogen atom is bonded to only one oxygen and cannot move around. Hopefully that makes sense.


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