ChemistryGhost - 23-7-2014 at 13:52
Does Zinc hydroxide Zn(OH)2 and hydroiodic acid HI(aq) react? Yes or no?
gdflp - 23-7-2014 at 14:00
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?
AJKOER - 25-7-2014 at 17:31
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]
Brain&Force - 25-7-2014 at 17:41
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).
ChemistryGhost - 11-8-2014 at 14:18
Thanks. It seems that Zinc iodide is best prepared from it's elements. 