How much heat from adding 250ml 85% phosphoric acid to 1700 ml water?

Mildewman

Mildewman

Active Member
How much heat will result from from slowly pouring 250ml 85% phosphoric acid into to 1700 ml ph-8 water?
Is it enough that its likely to melt a plastic (PET) homebrew bottle ? - (yes of course the mix will be labelled poison and not sit in the fridge duh :) )
Will i need to go outside to do this ? (would rather not, neighbours will think im making meth)
 
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Mildewman

Mildewman

Active Member
Why is it a stupid post? - i am making a ph down solution, and 85% phosphoric is considered a medium strength acid. I have never mixed 85% phosphoric acid with water before, so am trying to plan things out in advance. Youtube clips are always using a pyrex or stainless container, but i plan to use a 2l PET bottle. Want to know in advance if its going to boil / gas / melt / explode !
 
Jypsy Dog

Jypsy Dog

Well-Known Member
Mildewman said:
Why is it a stupid post? - i am making a ph down solution, and 85% phosphoric is considered a medium strength acid. I have never mixed 85% phosphoric acid with water before, so am trying to plan things out in advance. Youtube clips are always using a pyrex or stainless container, but i plan to use a 2l PET bottle. Want to know in advance if its going to boil / gas / melt / explode !
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forum.northernbrewer.com

Handling 85% Phosphoric acid?

[quote=“WiVikesFan”]…and maybe don’t start drinking until the acid is back on the shelf.[/quote]If you’re drinking while you mash in, you’re in for a loooonnngggg brew day, but yeah, this is great advice. Phosphoric is not as scary to me as bleach is, but using basic precautions with any...
forum.northernbrewer.com forum.northernbrewer.com
 
Mildewman

Mildewman

Active Member
No, but where i live the ph of the tapwater is 8 or above. There is so much calcium that the bottom of your cup of tea has visible chunks of calcium!
I have been using vinegar but it seems that phosphoric acid is the official way to acid up your water.
 
Mildewman

Mildewman

Active Member
So i carefully poured 250ml of 85% phosphoric acid into 1750ml of water, and nothing worrying happened. No heat or outgassing. Left cap loose for a few hours just in case of gas buildup, resulting liquid has a ph of 3, causes no burns on skin, but i tried putting some on my tongue and that was a bad idea :) - no burns but felt odd!
 
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