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Topic: Strengths of oxyacids  (Read 10962 times)

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spoudyal3

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Strengths of oxyacids
« on: April 28, 2006, 08:58:16 PM »
H2SO3, HSO3-, HClO4, HClO3, H3BO3

Is this the correct order of increasing acid strength (not using Ka values)?

H3BO3, HSO3-, HClO3, H2SO3, HClO4

I determined this order using the strengths of the conjugate bases. Thanks for the *delete me*

-DaKid
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Offline Donaldson Tan

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Re: Strengths of oxyacids
« Reply #1 on: April 28, 2006, 09:14:05 PM »
The more oxygen atoms present, the stronger the acid

The more electronegative the central atom (B or Cl), the more acidic the acid is.
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spoudyal3

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Re: Strengths of oxyacids
« Reply #2 on: April 28, 2006, 09:51:14 PM »
Right, so would that mean that HClO3 is stronger than H2SO3 since Cl is more electronegative and they both have the same number of oxygen atoms? Also, how can I determine acid strength when one acid has more oxygen atoms but the other has a more electronegative central atom? Does electronegativity count more towards acid strength than the number of oxygen atoms? Thanks.

-DaKid
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Offline Borek

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Re: Strengths of oxyacids
« Reply #3 on: April 29, 2006, 03:52:49 AM »
Quote from: DaKid on April 28, 2006, 09:51:14 PM
Also, how can I determine acid strength when one acid has more oxygen atoms but the other has a more electronegative central atom? Does electronegativity count more towards acid strength than the number of oxygen atoms?

These rules are simplified, so don't put too much weight and logic into them. You may easily compare HClO4 and HClO3, or HClO3 and HNO3, but comparing H2SO3 and HClO3 or HNO3 and HClO2 is at least tricky IMHO.
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