for dissolution of exothermic reaction inc in temp dec solubility whereas in endothermic inc in temp inc solubility . explain why ?

Solution -
While talking about endothermic dissolution reactions, heat energy comes from the bond breaking and bond forming being absorbed into the system as the solute dissolves. Increasing temperature  means the additional head energy is come into the system.
So as stated by Le Chatelier’s Principle,to absorb the added heat energy, the system will be promoting the dissolution reaction.so, as a result the solubility of the solute will increase.

As we know that heat is released In exothermic reaction when the solute is dissolved in a solution. Increasing temperature introduces more heat into the system and now the system will inhibit the dissolution reaction to adjust to this excess heatso, . Increasing temperature, therefore, decreases the solubility of the solute. 
 

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