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Subject: Reducing concentration of HCl from 10% to 40%

From: "Roger Blair" <Roger.Blair@...>
Date: 2010-01-19

I wish to prepare some HCl/H2O2 etchant, and I have 10% HCl. (10% HCl is $5 per gallon, but 40% HCl which is what I need is a lot
more expensive)

The solution as I see it is to reduce the 10% HCL solution to 40% concentration. I am thinking of using a Pyrex container on low
temp lab hotplate (100°?) to ‘boil’ off the H2O. (outdoors)

Since I know next to nothing about chemistry, not to mention whether this technique would actually produce what I need, I would like
to get some input here.

I have a general understanding of safety issues in handling chemicals, and wish to do this in a reasonably safe manner, BTW…

(I will be working with no more than 10 to 20oz. of 10% solution at a time, to minimize any environmental impact to me, and the
surroundings.)

Any advice would be appreciated.

Thanks,

Roger











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