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30 January, 12:22

A flask containing solid ammonium chloride becomes colder as water is added and the salt dissolves. is the magnitude of the lattice energy of nh4cl larger or smaller than the combined hydration energy of the ions?

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  1. 30 January, 14:25
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    The lattice energy of the solid ammonium chloride is larger tha the combined hydration energy of the ions. That's why the solution becomes cold when nh4cl is dissolved. In general, hydration is exothermic, but in this case, the stored energy in the solid is greater than that produced by the ions, making the reaction of nh4cl with water, endothermic.
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