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Is there a way to turn azeotropic hydrochloric acid into a gel?

I am trying to remove barnacles from the bottom of a boat and normal hydrochloric acid works, but it is tedious because in liquid form it just runs off, so I have to keep applying it over and over, kind of wearing the barnacle away.

If I could turn the HCl into a gel then it could just be applied for a few minutes and remove the whole barnacle.

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    $\begingroup$ Just use proper (and standard) cleaning agents. I've never heard before that someone use conc. HCl for cleaning (and I heard of way more original methods). $\endgroup$
    – Mithoron
    Commented May 8, 2020 at 16:39

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It turns out somebody already answered the question in a different post:

Xanthan Gum can handle hydrochloric / muriatic acid (HCl) for a while, depending on how concentrated the acid is. Here is how I made an HCl gel to clean an old toilet that was heavily coated with lime scale...

I first dissolved a level teaspoon of xanthan gum into 1/4 cup of rapidly stirring water. After a few hours of letting it sit, with occasional stirring, I had a very thick, viscous goo. To make the HCl gel, I mixed one part of this goo with 1.5 parts of 31% hydrocholoric acid, by volume. This gave a gel of a suitable viscosity to get the lime dissolved off the toilet. I don't know how long this gel would last before the HCl broke down the gum, but my gel lasted several hours, which was enough to get the toilet clean.

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  • $\begingroup$ If you are quoting another post it would be nice if you would include a link as reference. $\endgroup$
    – Buck Thorn
    Commented May 10, 2020 at 17:31

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