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freezing point curves
(mander.xyz)
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this post was submitted on 24 Jul 2024
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This is what happens when some kind of new compound is formed between these two, here it'll be series of sulfuric acid-water complexes. Same thing happens with metals when intermetallic compounds form, see titanium-nickel phase diagram. Normal case would be eutectic, see aluminum-silicon phase diagram
Here is a more complete chart https://chemistry.stackexchange.com/questions/165279/details-of-what-actually-happens-in-cold-sulfuric-acid-between-80-and-90-what
I see. So these are actually many sulfuric compounds in a trenchcoat chart.
Some of which are probably only a bit stable and so only exist in a mixture
Never mind between 80 and 90%, WTF is happening at 42.5%‽
There's a metastable phase somewhere out there and change of the most stable solid phase between 4-hydrate and 6.5-hydrate