[pure-silver] Re: Basic Chemistry
- From: eroustom@xxxxxxxxxxx
- To: pure-silver@xxxxxxxxxxxxx
- Date: Thu, 12 Jun 2008 23:31:34 +0000
That's super! I'll work up a chart or a method, and pin it up. I'll call it
Nobrega's Revenge!
Thanks,
Elias
-------------- Original message ----------------------
From: "Nicholas O. Lindan" <nolindan@xxxxxxxxxxxxx>
> <eroustom@xxxxxxxxxxx>
> > I use a hot bath to put my bottles of working
> > solutions in to bring them to temp.
>
> > If my solutions are all at basement temp of
> > 60 to 64F, what should the hot bath be at to
> > bring everything to 68-70F. 1 Liter glass
> > bottles (usually full). 6 Liter tub of water.
>
> Well, in typical high-school chemistry fashion:
>
> Neglecting the thermal effects of the bottles
> Assuming everything is in a perfectly insulating container
>
> Aq + Br + Cs = T * (A + B + C)
>
> A, B, C ... are the volumes
> q, r, s ... are their initial temperatures
> T is the final temperature
>
> Which should be sort of obvious, if you
> think about it.
>
> For a bottle (vol. A, temp q) in a water bath
> (vol. B, temp r), the temperature r at the start to
> reach a final temperature T should be
>
> r = [(A / B) * (T - q)] + T
>
> or: r = [(the ratio of the volumes)
> times
> (the difference in temperatures)]
> plus
> the final temperature
>
> Not a bad thing to tape to the wall.
>
> For one bottle:
>
> The volume ratio is 1:6
> The temperature difference is 68F - 62F = 6F
> The final temperature is to be 68F
>
> r = 1/6 * 6F + 68F
> = 70F water bath
>
> For 3 bottles the volume ratio is 3:6,
> the student can calculate the temperature.
> Quiz next Tuesday.
>
> In real life things will be different: you have a flow of
> heat to the air, the water bath container, the lab bench,
> the glass bottle, and you are loosing heat to evaporation,
> gaining heat from your stirring, loosing heat to warming
> the chemicals in the bottle (don't forget to use the
> volume of the water _before_ the chemicals were mixed in)...
>
> Experiment and making a table will be the fastest and
> most accurate method. Which is also sort of obvious.
>
> ==
> Nicholas O. Lindan
> Cleveland Engineering Design, LLC
> Cleveland, Ohio 44121
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