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Topic: Does metallic iron dissolve in water?  (Read 3717 times)

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Offline Corribus

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Re: Does metallic iron dissolve in water?
« Reply #15 on: February 14, 2023, 01:59:32 PM »
It's not even this simple. Metals can oxidize and dissolve, then the dissolved ions can get re-reduced into metallic particles of nano- or micron-scale dimensions. One could have a discussion then whether this constitutes a dissolved metal, versus a dispersion, but there it is.
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Offline pcm81

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Re: Does metallic iron dissolve in water?
« Reply #16 on: February 14, 2023, 02:03:51 PM »
It's not even this simple. Metals can oxidize and dissolve, then the dissolved ions can get re-reduced into metallic particles of nano- or micron-scale dimensions. One could have a discussion then whether this constitutes a dissolved metal, versus a dispersion, but there it is.
I thought solution is only if substance disassociates into its molecules, while particles would be dispersion or colloidal suspension.

Offline Hunter2

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Re: Does metallic iron dissolve in water?
« Reply #17 on: February 14, 2023, 02:22:54 PM »
Correct. A metal cannot dissolved in water as neutral element.

Offline Corribus

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Re: Does metallic iron dissolve in water?
« Reply #18 on: February 14, 2023, 04:15:11 PM »
I thought solution is only if substance disassociates into its molecules, while particles would be dispersion or colloidal suspension.

Well yes this is the convention. Beyond semantics, though, who is to say the concentration of lone metal atoms at all times is exactly zero? If you consider the nucleation and growth process of nanoparticles, there is (as far as I know) still some disagreement whether nucleation occurs first by reduction to metal atoms, followed by coalescence, or coalescence of hydrated ions followed by reduction. Probably depends on the reaction conditions, but the point is: there are probably lone metal atoms "dissolved" in solution at some point, even if only in a transitional state. So no, I do not agree that metal cannot be dissolved in water as a neutral element.

I have learned that in chemistry as soon as you say "never" or "cannot", it doesn't take long to be proven wrong.

What men are poets who can speak of Jupiter if he were like a man, but if he is an immense spinning sphere of methane and ammonia must be silent?  - Richard P. Feynman

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