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Topic: Ionic Salt=solid?  (Read 7567 times)

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Offline Classic

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Ionic Salt=solid?
« on: November 27, 2005, 10:59:01 PM »
My equation is: H2S(g) + Fe(NO3)2(aq) -----> FeS(s) + 2HNO3(aq)

My question is; since FeS, is an ionic salt (correct me if I'm wrong), then would FeS  be solid?

Thank You,
Classic
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Offline mike

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Re:Ionic Salt=solid?
« Reply #1 on: November 27, 2005, 11:14:04 PM »
I think this would depend on the situation. The FeS in the reaction is still in solution so it may be a solid (precipitate) or dissolved in solution. I think the solubility of FeS is not high but would possibly depend on the pH of the solution, temperature etc.

If you were to isolate the FeS from solution is could be a solid at room teperature depending on its melting point.
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Offline Classic

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Re:Ionic Salt=solid?
« Reply #2 on: November 27, 2005, 11:21:15 PM »
Thanks for the response.  I am in Intro. Chemistry so we don't calculate the temp, pH, etc.  At least I don't think so :).  So it will probably just be a solid.  Thanks again for the reinforcement.

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Offline mike

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Re:Ionic Salt=solid?
« Reply #3 on: November 27, 2005, 11:27:22 PM »
Yeah, I would say it woul be a solid that precipitates out of solution. :)
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Offline jdurg

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Re:Ionic Salt=solid?
« Reply #4 on: November 29, 2005, 08:42:50 AM »
Just as a rule of thumb;  If it's a sulfide that isn't an alkali metal sulfide (Li2S, Na2S, K2S, Rb2S, Cs2S) it will most likely be insoluble.  (I can't think of any sulfides that ARE soluble that aren't alkali metal sulfides).

In addition, if a compound is ionic then it is a solid.  The inter-unit attraction is so strong that it simply cannot exist as anything else at room temperature.
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Offline Alberto_Kravina

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Re:Ionic Salt=solid?
« Reply #5 on: November 29, 2005, 08:49:12 AM »
Quote
(I can't think of any sulfides that ARE soluble that aren't alkali metal sulfides).

I can! :D Ammonium sulfide IS soluble in water (a satured solution has w=25%)
« Last Edit: November 29, 2005, 08:50:37 AM by Alberto_Kravina »
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Offline Borek

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Re:Ionic Salt=solid?
« Reply #6 on: November 29, 2005, 08:54:37 AM »
Quote from: Alberto_Kravina on November 29, 2005, 08:49:12 AM
I can! :D Ammonium sulfide IS soluble in water (a satured solution has w=25%)

That's a weak one. In some general chemistry books properties of NH4+ are described together with properties of other alkali metals - they are very similar.
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Offline AWK

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Re:Ionic Salt=solid?
« Reply #7 on: November 30, 2005, 01:49:16 AM »
Sulfides of the second group, eg CaS are also soluble in water.
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Offline Alberto_Kravina

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Re:Ionic Salt=solid?
« Reply #8 on: November 30, 2005, 03:33:53 PM »
They're only moderately soluble in water.
...But you can't really say what "soluble" means, every salt is soluble in water!
In some books they say that a soluble salt has a solubility product that is bigger than 1*10-6, but it isn't really a "solid" definition  :P
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