Re: [DIYbio] Re: Thermogenesis via leaky mito membranes, is the proton channel getting hot or does the proton react?

On 12/14/2012 02:51 PM, Nathan McCorkle wrote:
> Your explanation made me think of sodium acetate heater pads, they go from being supersaturated to rapidly crystallising and
> giving off heat. I believe the supersaturated state has more energy because all the molecules would be more relaxed in a crystal,
> I'm not sure about entropy in this case though as both the supersaturated high-energy state has order, and the crystal state has
> order too. Since entropy is a measure of disorder right, I guess the crystal is actually more disordered than the solution???
>

Nahh. You may have a definition problem in your last statement. The entropy needs to be defined
in terms of the whole, crystals, water, plus surroundings accepting heat.

It's fun how sodium acetate can stay liquid until a vibration sets it off crystallizing.
I'd not heard of that before.

Heat flows out of most solutions as they precipitate out crystals. AKA heat of solution or reaction.

Formation of bonds releases energy is another way to think of it. Precipitating crystals is obvious
ionic bonds of crystal lattice forming.

Solution reactions that make bonds without precipitation would be exothermic also.

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