ChemistryGhost
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Does Zinc hydroxide and hydroiodic acid react?
Does Zinc hydroxide Zn(OH)2 and hydroiodic acid HI(aq) react? Yes or no?
"Imagination is more important than knowledge" ~Einstein
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gdflp
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It's a hydroxide and an acid whose salt is soluble yes of course they react. Why wouldn't they. Also, how can you get hydroiodic acid if you don't
know this?
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AJKOER
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Yes, but perhaps seemingly no. To explain, here is a quote from Atomistry.com on ZnI2:
"Unlike the chloride and bromide, it [ZnI2] is readily oxidised by nitrogen peroxide and by warming in the air - if the air is moist the reaction
occurs at ordinary temperatures. "
So, my take on what happens to the formed ZnI2 on exposure to moist air:
ZnI2 + 2 H2O = Zn(OH)2 + 2 HI
4 HI + O2 ---) 2 H2O + 2 I2
So, if we start with Zn(OH)2 and HI (which can form a mist liberating Iodine in air), it may not be clear that ZnI2 was, indeed, formed.
[Edited on 26-7-2014 by AJKOER]
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Brain&Force
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If you're having issues producing zinc iodide, try adding zinc metal to iodine dissolved in methanol (DraconicAcid uses this method on a regular basis
as a lab for his students).
At the end of the day, simulating atoms doesn't beat working with the real things...
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ChemistryGhost
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Thanks. It seems that Zinc iodide is best prepared from it's elements.
"Imagination is more important than knowledge" ~Einstein
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