Endothermic and Exothermic Reactions in salt dissolving in water. Please explain
ID: 839083 • Letter: E
Question
Endothermic and Exothermic Reactions in salt dissolving in water. Please explain these two questions to me. Thanks
Two opposite heat processes occur whenever a salt dissolves in water. One process requires hear energy to separate the ions in the solid salt and always has a positive value (delta Hlatt = +). The other process releases energy when the water molecules surround(solvate)the ions and always has a negative value ( delta Hhydr = -). The sum of these two energies determines whether heat is released (exothermic; delta Hsoln = -) or absorbed (endothermic; delta Hsoln = +)in the overall dissolution process, i.i.e., delta Hsoln = delta Hlatt + delta Hhydr. delta Based on this information and the above data, what process involved more energy in the endothermic reactions-separaiing the ions or solvating the ions? Explain. Based on this information and the above data, what process involved morecncrgy in the exothermic reactions-separaiing the ions or solvating the ions? Explain.Explanation / Answer
1] based on the information the one with the greater endothermic reaction energy
will have delta H more positive so that the overall reaction would have a positive delta H
as we know delta H >0 for endothermic reaction
a]so seperating ion in the solid salt will have a delta H >0
b]and water molecule surrounding the ions will have delta H < 0
so the first process will have a greater delta H .....
2]based on the information the one with the greater exothermic energy will be
the one which will have a delta H more negative as the delta H for an exothermic reaction will be < 0
so
solvating the ions will lead in a delta H < 0
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