1) In solution formation solvation always release more energy than that required
ID: 1011823 • Letter: 1
Question
1) In solution formation solvation always release more energy than that required to separate particles, so the overall process is always exothermic. true or false
2) For most ionic and molecular solids solubility generally increases as temperature increases true or false
3) The solubility of a substance is best described by which of the following?
a) the ability of the substance to dissolve in water
b) the ability of the substance to dissociate into ions when dissolved in water
c) the maximum amount of a substance that can dissolve in a specific amount of solvent
d) the mass of solvent necessary to completely dissolve 100g of the substance
Explanation / Answer
1) False - Solvation, or dissolution, is the process by which a solute dissolves into a solvent. This can be endothermic or exothermic Not always exothermic.For solvation to occur, energy is required to release individual ions and molecules from the crystal lattices in which they are present. This is necessary to break the attractions the ions have with each other and is equal to the solid's lattice free energy (the energy released at the formation of the lattice as the ions bonded with each other). The energy for this comes from the energy released when ions of the lattice associate with molecules of the solvent.
2) True :- Dissolving of a solid in water is, in most cases, an endothermic reaction. In dissolving, as in melting, a solid becomes a liquid. It takes more energy to be a liquid than to be a solid at the same temperature. When the solution becomes saturated at any temperature, a dynamic equilibrium is established between the dissolved and undissolved solid. When heat is added that results in a higher temperature, the extra heat favors the endothermic reaction, and more solid dissolves rather than crystallizes until new equilibrium system is established again. Hence, at a higher temperature, more solid is dissolved in water. This increases the solid's solubility.
3) Answer is C
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