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yzdm

O2 activity is expressed as SO42-/H2S

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Hi there,

 

I have a question when i read a pic like this:

post-12284-0-54224900-1505460979_thumb.png

What is that mean by saying:"O2 activity is expressed as SO42-/H2S". Any more information can be delivered?

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Guest Melika Sharifi

Hi Yzdm,

 

That means the ratio of SO4--to HS- would set the redox state. If you look at the reaction between H2S and SO42-:

 

H2S + 2 O2 - = SO42- + 2 H+

 

At a constant pH, the ratio of activity of the sulfate and hydrogen sulfide may be expressed as function of O2 activity.

 

Bests,

Melika Sharifi

Aqueous Solutions LLC

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Hi Melika Sharifi,

 

We can get log(SO4--/H2S) = logK + 2logO2,aq, according to H2S + 2 O2 - = SO42- + 2 H+.

 

I suppose ' O2 - ' in the reaction means 'O2,aq' actually?

 

Bests,

ChenYang

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Guest Melika Sharifi

Hi ChenYang,

 

Yes, you are right. It was a typo; the correct balanced reaction is:

H2S + 2 O2 = 2 H+ + SO4--
Thanks,
Melika Sharifi
Aqueous Solutions LLC

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