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The value of Kw changes when heat is added to the system. Since the autoprotolysis of water is an endothermic reaction, adding heat will increase the value of Kw because the reaction will favor the formation of products more. In other words, the equilibrium will shift to the right.
Charisse Vu 1H wrote:Can the value of Kw ever change? I remember Professor Lavelle talking about temperature being able to change Kw but I don't really recall why or if temperature was the only factor that could change its value.
He discussed this some more today. Temperature is the only factor that can change Kw. Thus, if you increase the temperature, the Kw value will also change. In an exothermic reaction, when you increase the temperature, there will be more reactants; thus, the Kw value will decrease. On the other hand, in an endothermic reaction, when you increase the temperature, there will be more products; thus, the Kw value will increase.
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