K value- Temp


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Julia Go 2L
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K value- Temp

Postby Julia Go 2L » Sun Mar 03, 2019 2:16 pm

Why does the value of K change when the temperature changes?

Kathryn Wilhem 1I
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Re: K value- Temp

Postby Kathryn Wilhem 1I » Sun Mar 03, 2019 2:21 pm

Using leChatelier's principle, when the temperature is changed, depending on whether the reaction is endothermic or exothermic, the reaction will favor either the reactants or the products. We use the equation -deltaH/R(1/T2 - 1/T1) = ln(K2/K1) to find what the new K is when the temperature is changed.

almaochoa2D
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Re: K value- Temp

Postby almaochoa2D » Mon Mar 04, 2019 11:06 am

If you remember temperature is the only thing that can change K.

anthony_trieu2L
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Re: K value- Temp

Postby anthony_trieu2L » Mon Mar 04, 2019 11:25 am

In addition, in order to use the equation stated above, you must assume that delta H and delta S are constant. This equation allows us to determine K at different temperatures is these values (delta H and delta S) are known.

Nicolle Fernandez 1E
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Re: K value- Temp

Postby Nicolle Fernandez 1E » Mon Mar 04, 2019 1:13 pm

When temperature changes a reaction will either favor reactants or products more which means K will change.

LedaKnowles2E
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Re: K value- Temp

Postby LedaKnowles2E » Mon Mar 04, 2019 1:18 pm

A temperature change pushes the reaction to either the left or right depending on whether heat is a reactant or product (depending on whether the rxn is exo or endothermic). This gives the reaction a new equilibrium point, so k changes.

Jack Hewitt 2H
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Re: K value- Temp

Postby Jack Hewitt 2H » Tue Mar 05, 2019 2:44 pm

Temperature is the only thing that can change the value of K.


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