September 25, 2020, 10:34:40 PM
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Topic: Extract copper sulfate from Bordeaux mixture  (Read 241 times)

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Offline Simone90

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Extract copper sulfate from Bordeaux mixture
« on: August 24, 2020, 06:08:19 AM »
Hi everyone.
Is it possible to separate copper sulfate from a bordeaux mixture?
The one i'm using, for 100 grams, is 20g of copper sulfate neutalized with calcium hydorxide and 80g of "coformulants".
So i took about 50g of the mixturre and added about 250g of water. The solution was really cloudy, lightly blue.
I let everything filter during the night and i end up with a clear dark brown solution. The filter was full of a blue sludge.

Does anyone have some suggestion avout what happened or what I could do?

Sorry for my english.


Offline chenbeier

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Re: Extract copper sulfate from Bordeaux mixture
« Reply #1 on: August 25, 2020, 07:35:01 AM »
The blue sludge is copper hydroxide. This you can neutralize with sulfuric acid to obtain copper sulfate back.

Offline Simone90

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Re: Extract copper sulfate from Bordeaux mixture
« Reply #2 on: August 29, 2020, 12:52:41 PM »
Hehe...i'm trying to extract copper sulfate to make sulfuric acid. I know i could just buy it, but it becomed a challange for me to make sulfuric acid and nitric acid with almost nothing. Copper sulfate is just one of the experiments i'm doing.
The problem with fertilizers is the they're full of junk.

Offline AWK

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Re: Extract copper sulfate from Bordeaux mixture
« Reply #3 on: August 29, 2020, 01:56:08 PM »
Bordeaux mixture was prepared from copper sulfate, but it does not contain copper sulfate. Thermal decomposition of calcium sulfate needs very high temperature at which SO3 decomposes to SO2.
AWK

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