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Topic: Arsenic-Sulphur affinity  (Read 3936 times)

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Offline AlbertoA

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Arsenic-Sulphur affinity
« on: October 10, 2011, 06:56:29 PM »
which As has more affinity for the H2S? the As(III)or the As(V)
and why?
I read that As(III) has more affinity, but I don't see any explanation of that behaviour
perhaps As (III) is a soft lewis acid and H2S a soft base?

Offline Yakimikku

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Re: Arsenic-Sulphur affinity
« Reply #1 on: October 12, 2011, 06:26:59 PM »
I think you have it. As(V) is definitely harder than As(III) because of the increase in oxidation state. H2S, being as soft base would likely prefer binding to As(III) for that reason. Other than confirming your reasoning, I don't specifically know much about As.

Offline Wald_ron

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Re: Arsenic-Sulphur affinity
« Reply #2 on: October 13, 2011, 10:18:14 AM »
As(III) has a lower charge density than As(V) which means that As(V) is harder. As(III) is therefore softer than As(V) and H2S is a soft base. Soft prefers Soft. Thus As(III) has more affinity for H2S.
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