[pure-silver] Re: Basic Chemistry
- From: Howard Efner <hfefner@xxxxxxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Sun, 15 Jun 2008 09:25:17 -0600
On Jun 15, 2008, at 5:15 AM, Peter Badcock wrote:
Nicholas,
Should T not be expressed in degrees Kelvin rather than degF ?
This then takes into account the absolute nature of the temps in
the system, rather than a temperature that has been scaled and
offset (as are degF and degC).
Peter
The key factor in the equations is the change in temperature for the
solution and the water bath. If the correct units are used for heat
capacity, it does not matter if you use F, C, K or Rankin. Q (heat)
= change in temperature x mass x heat capacity (heat unit/mass x
temp. unit)
In an ideal system, Q(lost) = Q (gained). Or for a cold bottle of
solution going into a warm water bath, and they end up at a final
temperature - - -
Q(lost) = mass of bath water x (final temp. - initial temp of bath) x
heat capacity =
Q(gained = mass of solution x (final temp. - initial temp of
solution) x heat capacity
Now we could really overkill the problem and include corrections for
the heat capacity of the bath container, the heat capacity of the
bottle, and the heat capacity of the solution(s) which will be
slightly different from pure water. Also a term could be included to
account for the loss of heat from the water bath to the room.
Howard
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