freezing point curves

Comments

• arandomthought@sh.itjust.works ⁨9⁩ ⁨months⁩ ago

  Dare someone smarter than me explain what the ever loving fuck is going on there?

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  • skillissuer@discuss.tchncs.de ⁨9⁩ ⁨months⁩ ago

    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

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    • skillissuer@discuss.tchncs.de ⁨9⁩ ⁨months⁩ ago

      Here is a more complete chart …stackexchange.com/…/details-of-what-actually-hap…

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  • Ravi@feddit.org ⁨9⁩ ⁨months⁩ ago

    My uneducated understanding is that the chart shows at which temperatures sulfuric acid freezes depending on the concentration. Also in my very basic understanding of physics and chemistry I would have thought that it’s linear or exponential or something predictable and not that jumpy.

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    • skillissuer@discuss.tchncs.de ⁨9⁩ ⁨months⁩ ago

      In normal cases you’d see two curves going away from pure compounds downwards to a common minimum, which is eutectic point

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    • marcos@lemmy.world ⁨9⁩ ⁨months⁩ ago

      Here’s what a normal curve looks like:

      i2.wp.com/…/Brine-Pro-salinity-chart.png

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  • phdepressed@sh.itjust.works ⁨9⁩ ⁨months⁩ ago

    Sulfuric acid and water has various H2SO4 and H2O ratios. So like 1 H2SO4 and 6, 3, 2, or 1 H2O it also has just the H2SO4 and H2S2O7. These are present as local points within solutions and with different prominence depending on the amount of water added. These 8 different ratios each have different freezing points.

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  • TheSlad@sh.itjust.works ⁨9⁩ ⁨months⁩ ago

    If I had to guess, I would assume that there are different molecular lattices that sulfuric acid and water can form at different concentrations and that these different lattices have different freezing points. I will now go look it up.

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    • skillissuer@discuss.tchncs.de ⁨9⁩ ⁨months⁩ ago

      What you’re describing are different crystalline phases of pure compounds, but this does not give you new minima, you need some new compound to form for that

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  • Gladaed@feddit.org ⁨9⁩ ⁨months⁩ ago

    Physics.

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• lemming741@lemmy.world ⁨9⁩ ⁨months⁩ ago

  That chart stops at 100% what a noob. Back to the lab with ya!

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  • PenisDuckCuck9001@lemmynsfw.com ⁨9⁩ ⁨months⁩ ago

    Because 100% concentration is for noobs

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• Someonelol@lemmy.dbzer0.com ⁨9⁩ ⁨months⁩ ago

  It could get a lot messier. Adding in a third variable of pressure would’ve made the measurements so much harder.

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  • Kowowow@lemmy.ca ⁨9⁩ ⁨months⁩ ago

    Would be interesting to use pressure to keep the curve as stable as possible

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    • flambonkscious@sh.itjust.works ⁨9⁩ ⁨months⁩ ago

      The graph for that would be wild, presumably. Wouldn’t the axes have to be extremely inconsistent?

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• Evil_Shrubbery@lemm.ee ⁨9⁩ ⁨months⁩ ago

  Yeah, all the pretenders and management saying if you can’t show it in extreme simplistic elegance you obviously don’t understand it enough. Eat shit.

  … what Im saying is that I would just make up my own pretty curve, the scientific community would disagree but the public would accept it & grants would roll my way easier.

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  • ramble81@lemm.ee ⁨9⁩ ⁨months⁩ ago

    Especially that bump right around 42%. You know they retested that multiple times with a “wtf is going on?”

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    • Evil_Shrubbery@lemm.ee ⁨9⁩ ⁨months⁩ ago

      Not only that - you know they still got a bunch of “ok, but are you sure you measured it right” questions even after explaining it all in the paper.

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  • Notyou@sopuli.xyz ⁨9⁩ ⁨months⁩ ago

    I remember the first time I saw Newtonian fluids in video. I feel like my brain broke. How much more science have I been taught inaccurately?

    The real world is crazy weird. This multiple freezing points post is also fucking me up too.

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    • Eheran@lemmy.world ⁨9⁩ ⁨months⁩ ago

      Newtonian fluids are just normal fluids, like water. The so not change their viscosity under sheer stress. I assume you mean non-newtonian fluids.

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• MataVatnik@lemmy.world ⁨9⁩ ⁨months⁩ ago

  Me at my job right now. Apparently titrations and loss on ignition is some of the hardest shit to ever do in science

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  • humbletightband@lemmy.dbzer0.com ⁨9⁩ ⁨months⁩ ago

    Titration is hard, I agree. But blowing glass with a custom glass composition is way harder imo

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    • MataVatnik@lemmy.world ⁨9⁩ ⁨months⁩ ago

      The thing is these are established methods with clear instructions but I can get the right numbers for whatever reason it’s really making me question if I’m even a chemist. Blowing glass, now that sounds pretty fucking hard actually

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• Admetus@sopuli.xyz ⁨9⁩ ⁨months⁩ ago

  Chemistry and Physics combined make very interesting ‘resonances’ in molecular behaviour. That’s as educated a guess I may make.

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• BreadOven@lemmy.world ⁨9⁩ ⁨months⁩ ago

  Wait until you see phase diagrams for liquids, not to mention liquids with different concentrations.

  Or freezing and types of ice formed.

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