1
| Decomposition of Ca(OH)_2 15.1
| Decomposition of water 69.0
Balance 1.1 | Decomposition of carbide 3.9
_____ | _____
|
146.1 | 146.1
which comes to the same thing. Putting the matter in another shape, it may
be said that the reaction between calcium carbide and water is exothermic,
evolving either 14.0 or 29.1 calories according as the byproduct is calcium
oxide or solid calcium hydroxide; and therefore either reaction proceeds
without external assistance in the cold. The reaction between carbide and
slaked lime, however, is endothermic, absorbing 1.1 calories; and therefore
it requires external assistance (presence of an elevated temperature) to
start it, or continuous introduction of heat (as from the reaction between
the rest of the carbide present and the water) to cause it to proceed. Of
itself, and were it not for the disadvantages attending the production of a
temperature remotely approaching 400 deg.
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