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Sodium Acetate is widely used in hot packs due to the fact that it produces an exothermic reaction when it reacts with water.

I decided to see if other sodium salts, such as sodium bromide, sodium sulphate, etc. would produce similar exothermic reactions in hopes of finding a potential substitute for sodium acetate.

Is there a reason why some of these sodium salts would react with water to produce a larger enthalpy change than others? Is this predictable given the molecules' properties and/or geometry? Can enthalpy change at all be predicted given every property we currently know about these molecules?

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  • $\begingroup$ Difficult to predict. $\endgroup$ – Lighthart Apr 20 '16 at 14:55
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    $\begingroup$ It is also worth noting that the exothermic behavior of sodium acetate and water is the exothermic crystallization of a supersaturated solution of sodium acetate in water. Go look up hot ice $\endgroup$ – Ben Norris Apr 20 '16 at 15:04

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