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Topic: Which Is The Stronger Acid  (Read 2355 times)

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Offline student8607

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Which Is The Stronger Acid
« on: March 03, 2009, 05:04:40 PM »
H2S or H2Se

I thought for binary acids: increased electronegativity meant increased acid strengths, so why wouldn't H2S be the stronger acid?
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Offline nj_bartel

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Re: Which Is The Stronger Acid
« Reply #1 on: March 03, 2009, 05:34:51 PM »
Increased conjugate base stability = stronger acid.  Larger atoms are more polarizable - the negative charge has less of an effect on the overall stability of the molecule.
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Offline student8607

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Re: Which Is The Stronger Acid
« Reply #2 on: March 03, 2009, 07:19:04 PM »
OK. I didn't know when to apply that.
Thanks.
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