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Chemistry
Level
3
Solubility of increases upon:
It is an exothermic process
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Does not depend upon temperature
decreasing temperature
increasing temperature
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Solubility is defined as the concentration of the solute in a saturated solution. So when considering the increase in solubility with temperature, you have to check the enthalpy of solution of N a O H in a saturated solution of N a O H . When you dissolve N a O H in pure water, the process is highly exothermic, but as the concentration of N a O H increases, the process becomes less exothermic and eventually near the saturation point it becomes endothermic (it becomes less favourable for more N a O H to dissolve). So according to Le Chatelier’s Principle, although the dissolution process is overall exothermic, since solubility is determined only at the saturation point, the solubility increases with increase in temperature.