• humanspiral@lemmy.ca
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    3 months ago

    H2O is neutral PH, and so answer is no. But then water tends to have a bunch of shit disolved in it. So answer is yes.

    A self-contradicting proposition based on ambiguity of definition of water, of all things. This statement can be used to make HAL explode.

    • MunkyNutts@lemmy.world
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      3 months ago

      If you take into consideration the self-ionization of water, it’s both, at the same time.

      2 H2O -> H3O+ + -OH

      • humanspiral@lemmy.ca
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        3 months ago

        AFAIU, it doesn’t change the PH neutrality.

        I understand that they self combine/react again? But is that reaction still water?

        • NielsBohron@lemmy.world
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          3 months ago

          Autoionization and the reverse reaction are constantly happening in water, and when the reaction is happening at the same rate forward and backward the system is said to be “at dynamic equilibrium” (aka, stuff is happening, but there’s no net change)

          In pure water, the equilibrium concentration of hydronium and hydroxide are equal, so it’s said to be neutral. At room temperature, that equilibrium concentration is approximately 1*10^-7 moles per liter, which gives a pH of 7 (since pH is defined as the negative log _10 of hydronium concentration)

  • Someonelol@lemmy.dbzer0.com
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    3 months ago

    Little bits of it oscillate between hydronium and hydroxide so a little of both but not enough to make a difference.

    • NielsBohron@lemmy.world
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      3 months ago

      That’s why the meme works. It’s not because water autoionizes; it’s because water is amphoteric, meaning it can act as either a Brønsted-Lowry acid or BL base depending on what what it’s reacting with. Put water with ammonia, and water acts as an acid. Put water with acetic acid, and it acts as a base

      Source: I teach college chemistry

        • TheOakTree@lemm.ee
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          3 months ago

          I once brought up in a family dinner how incredible and strange water is, and how we don’t really think about it.

          It appears naturally in all three phases, expands when frozen, has a high surface tension, has a high specific heat, and can behave as a mild base or acid. Oh, and all the living stuff has water in it.

          Nobody really understood what I meant except my sister.

          • SolarMonkey@slrpnk.net
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            3 months ago

            If it makes you feel any better, I totally get it.

            I’ve thought many times how different the universe would be (would complex life on earth even work the same way???) if frozen water became more dense and sank like most frozen substances.

            • TheOakTree@lemm.ee
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              3 months ago

              Neat, I will be saving this and reading it when I’m less busy… maybe I’ll get back to you on it.