In the following tutorial, I show how to make sulfuric acid from household product, and how to concentrate it:
https://youtu.be/sJs31qK2ClM
I initially obtain a relatively clean dilute acid, but when I concentrate it by boiling of the water, I also concentrate the amount of impurities. These impurities don't seem to dissolve, and I can remove part of them by decanting the product. I would like to completely filter them out. However, I cannot use a coffee filter because the concentrated acid instantly reacts with it, adding more pollution.
Are there other way of filtering sulfuric acid?
V. G. Rousseau
Alternatively, another efficient way of getting concentrated sulfuric acid from drain opener is explained here: https://youtu.be/Bh0eYpVQ3lQ
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