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S.C. Wack
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How would a hypochlorite oxidation be performed? I'd convert the Ca to K first, so that K salts only are present, for the dichromate. How to ensure
there is no unreacted hypochlorite before acidification, without causing more problems?
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blogfast25
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Quote: Originally posted by S.C. Wack  | | How would a hypochlorite oxidation be performed? I'd convert the Ca to K first, so that K salts only are present, for the dichromate. How to ensure
there is no unreacted hypochlorite before acidification, without causing more problems? |
Why not use thin bleach (4 - 5 % NaClO usually) and drive off any unreacted ClO<sup?-</sup> in strongly acid conditions as
Cl2?
How would that 'cause more problems'?
[Edited on 20-2-2016 by blogfast25]
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S.C. Wack
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I just don't have that same confidence that this mixture of K, chloride, water, sulfuric acid, and hypochlorous acid does not interact with dichromate
in some way. It shouldn't be hard to test...thanks for volunteering me.
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blogfast25
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The OP's objective is to separate Ni and Cr, primarily to obtain some Ni compound, not to prepare chromate.
Prepare dichromate by fusing KNO3 with Cr2O3. Very high yield even with pottery Cr2O3.
[Edited on 20-2-2016 by blogfast25]
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S.C. Wack
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| Quote: Originally posted by Elawr | | It would be fun to separate and isolate these two metals using the limited technology I have here in my garage, (i.e baking soda, vinegar, hotplate,
etc.). |
Dichromate. Potassium, as specifically indicated. It's a wonderful way to isolate your Cr, I'm not the one who brought up chromate, I actually care,
and if you are at chromate already then why not?
It's all true Cl will be distilled off with water from the acidified hypochlorite filtrate without problems other than the poisonous corrosive vapors
thing. I guess I have to say that boiling the excess alkaline Ca hypochlorite instead is also a possibility, and if one thinks that reducing to some
insoluble not-hexavalent-Cr sludge instead is the start of some desired isolation path then go that way by all means.
[Edited on 21-2-2016 by S.C. Wack]
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blogfast25
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| Quote: Originally posted by S.C. Wack |
Dichromate. Potassium, as specifically indicated. It's a wonderful way to isolate your Cr, I'm not the one who brought up chromate, I actually care,
and if you are at chromate already then why not?
It's all true Cl will be distilled off with water from the acidified hypochlorite filtrate without problems other than the poisonous corrosive vapors
thing. I guess I have to say that if one thinks that reducing to some insoluble Cr sludge instead is the start of some desired isolation path then go
that way by all means. |
I suggested H2O2, not hypochlorite.
But for those wanting to use weak NaClO and blow off any excess hypochlorite in acid conditions as Cl2, I can't foresee any particular
problems with that. I could be wrong on that, of course. If you foresee interference maybe you should search for information about that?
| Quote: | | I guess I have to say that if one thinks that reducing to some insoluble Cr sludge instead is the start of some desired isolation path then go that
way by all means. |
Eh? Who brought that up or believes that?
[Edited on 21-2-2016 by blogfast25]
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