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Old Sep 19th 2017, 10:00 AM   #1
maker
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Join Date: Sep 2017
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What remains after water evaporates from sulfuric acid Solution

Hi,

I have a 5 gallon bucket that was 1/2 filled with an H2SO4 solution (15% by volume). The solution also had 6051 aluminum rod that was sitting inside.

After sitting for several months, all of the water has evaporated and a portion of the aluminum tubing has corroded away. What is left is white crystal powder attached to the remaining aluminum.

Can someone tell me what this substance is? I'm guessing it is salt crystals attached to aluminum rod, but I'm no chemist! Assuming this is something other than salt, what is the best method of disposal (i.e. Bring it to hazardous waste disposal, dilute and flush, poor it in my garden , pour it in my neighbors garden )?

My Ph meter is broken, so I can't even check the Ph at the moment.

Thanks,
Marc

P.S. This question is not for a class. I do some anodizing as a hobby, but haven't done it in a while. The chemicals have sat unused during that time.

Last edited by maker; Sep 19th 2017 at 02:59 PM. Reason: Added detail
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