Re: Copper (hydr)oxide and ammonium chloride

"Dirk Bruere at Neopax" <dirk@xxxxxxxxxx> wrote in message
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>>>>>>Dirk Bruere at Neopax wrote:
>>>>>>>Will a soln of ammonium chloride dissolve copper (hydr)oxide?
>>>>>
>>>>>Uncle Al wrote:
>>>>>>What are the respective pKa values? Most likely you will get a mess of
>>>>>>slighly ammonia-complexed copper oxo-chlorides.
>>>>>
>>>>>Dirk
>>>>>Maybe, but the only question that really interests me is whether adding
>>>>>NH4Cl
>>>>>will prevent a precipitate forming as Cu Salicylate soln goes from Cu(I) to
>>>>>CU(II)
>>>>
>>>>[hanson]
>>>>For your topical application purposes, Dirk, I recommend
>>>>that to refrain from adding NH4Cl as stabilizer to your mix.
>>>>NH4Cl may cause the isotonic properties to shift and irritate
>>>>your skin. Instead use a milder chelant like NH4 citrate, NH4
>>>>tartrate or NH4-acetate. The NH4 citrate and the NH4 tartrate
>>>>are Cu-sequestrants is their own right. Good luck.
>>>>hanson
>>>
>> [Dirk]
>>>Thanks.
>>>However, where do I get these compounds?
>>>
>> [hanson]
>> Make them up in situ and just as much as you need.
>> Buy from the grocer, supermarket or health store
>> Clear vinegar for the acetate, Tartaric acid (Wine acid)
>> for the tartrate and Citric acid for the citrate. Buy clear
>> household ammonia to neutralize these acids. You can
>> do it by tasting. When you can't smell the ammonia in
>> the solution no more nor when it does not taste sour
>> any longer then you are in the right pH range of 4.7 to 7.8
>> Or you can use a pH meter..... ahahaha... ahahaha..
>> You can play this smell/taste game back and forth until
>> it's "right"... which is when you'll have your desired
>> compounds in a solution that you can concentrate or
>> even crystallize it by evaporation... and then add'em
>> to the rest of your magic potion and see how much it takes
>> to keep the Cu in solution.
>
> Dirk
> I'll give that a try.
> How about pure ammonia to dissolve the hydroxide?
> Or would that be a bit harsh on the skin?
>
[hanson]
Yeah, give that a try too & see whether the solution
stays together. But first things first. Use this alkaline
rel high pH ~ 10 solution only if you can say from
experience that your skin tolerates classical high pH
Sodium Palmitate soap bars or the honey gel like
Potassium handsoap.
>
[Dirk]
> Alternatively, ammonium salicylate?
>
[hanson]
Dunno. Try it. I guess it won't help because you
don't get an excess if sequestrant for the Cu this way.
Take care, Dirk.
hanson



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