Kw with increasing temperature in endothermic reaction

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Phuong Tran 1G
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Joined: Sat Sep 14, 2019 12:16 am

Kw with increasing temperature in endothermic reaction

Postby Phuong Tran 1G » Sat Feb 08, 2020 4:33 pm

The autoprotolysis reaction is endothermic; do you expect Kw to increase or decrease with increasing temperature?

Since it’s endothermic, the reaction is absorbing heat so with increasing temperature, Kw would decrease? Is it the same idea as it is for K?

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Re: Kw with increasing temperature in endothermic reaction

Postby Chem_Mod » Sat Feb 08, 2020 6:14 pm

Kw should increase with increasing temperature. Think of higher temperature as more heat available for the reaction. Since it is endothermic, heat goes on the reactant side. Apply Le Chatlier: more reactant pushes reaction to form more products. More products at equilibrium mean higher K value, hence higher Kw at higher temperature


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