NEMO-Chemistry
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Sodium Hydroxide and Nickel
A while back i asked about dissolving Nickel, I couldnt find the thread but my ropey memory said Woelen had suggested putting the shavings in sodium
hydroxide and letting it evaporate.
So I have done this, BTW i got a new radiator in the lab  so its warm and dry
now.
Anyway i added some water until it just went to a liquid over the Nickel flakes. Its now pretty dry but has made large almost needle like crystals!!
most if not all the Nickel is there and no colour change. But I have never seen sodium hydroxide prills go to a liquid then give large flake/needle
like crystals!!
Any ideas? Oh and yeah i did look it up on wiki after and discovered it potassium hydroxide your supposed to use not sodium .
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Boffis
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Nickel will not dissolve in sodium hydroxide solution. In fact we use nickel crucibles for NaOH fusions.
NaOH solution absorbs carbon dioxide from the atmosphere fairly readily and the resulting sodium carbonate is very insoluble in strong NaOH solution.
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NEMO-Chemistry
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Quote: Originally posted by Boffis  | Nickel will not dissolve in sodium hydroxide solution. In fact we use nickel crucibles for NaOH fusions.
NaOH solution absorbs carbon dioxide from the atmosphere fairly readily and the resulting sodium carbonate is very insoluble in strong NaOH solution.
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Which i have just nicely confirmed this by an experiment lol. Yeah it was a jumbled memory i didnt bother to check, i will get it all into solution
and filter off my nice clean Nickel flakes.
Obviously the treatment with hot hydroxide was a washing step..... 
I will plonk (technical term) into POTASSIUM hydroxide.
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phlogiston
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Potassium hydroxide solution will not dissolve nickel either.
I'm curious what wiki site said that it would.
Neither the wikipedia and the SM wiki site entries for nickel mention it. In fact the wikipedia site specifically mentions nickel being highly
resistant to alkali and useful for storing sodium hydroxide and potassium hydroxide.
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NEMO-Chemistry
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Woelen i thought mentioned it on here.... and wikipedia now i got my glasses on says nickel 2 salts and potassium hydroxide not Nickel, so that was my
mistake.
Which leaves me with a problem dissolving my nickel flakes!
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NEMO-Chemistry
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Forget it, I am in stupid mode today, Woelen was on about something else, looks like ferric chloride with HCl and then ammonia will dissolve it. No
Hydrogen peroxide at the moment, its something i dont consider good to have around at the moment.
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