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EXOTHERMIC REACTION: HEAT PACK - REUSABLE (1 of 2)
Crystallization of Solution Increases Temperature
Supersaturated solution of sodium acetate is induced to crystallize by motion of a metal plate. As the salt precipitates the temperature of the solution rises to melting point of the salt (58 C). Pack is reused by heating it enough to redissolve solute.
Copyright:© 1993 Richard Megna - Fundamental Photographs
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