does changing temperature change equilirium constant and solubility constant?

[Smooth Operater]

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does changing temperature change equilirium constant and solubility constant? If so, why? Is there en euqation to prove it? Thanks!

Thanks!

 

[Gordon9721]

temperature change has no effect on the equilibrium/solubility constants. it only affects the rate of the rxn. i don't think there is an equation or anything, i just remember the explanation from a kaplan practice test i took today.

 

[allstardentist]

temperature does have effect on the keq. keq of a reaction changes as a function of temp. ksp is also influenced by temp. change.

 

[Gordon9721]

are you sure? i know that temperature affects the solubility and equilibrium-lechateliers principle-but i wasn't sure it affected or could be equated in a problem regarding Keq..........

 

[cdmOMR]

heat is generally a "product" or a "reactant" of a reaction (depending on if its endo/exothermic) in terms thats its needed or is given off, respectively. Increasing heat (by increasing tempertaure) of an endothermic reaction where heat is a "reactant" will decrease the Keq. Increasing heat of an exothermic reaction with heat being a "product" will increase the Keq.

 

[Nazafarin]

According to the Examcracker's chemistry book pg.39: "since the rate constant depends on temperature, the equilibrium constant must also depend uopn temperature." Also, it's mentioned that the solubility product changes only with temperature. Hope this helps.👍

 

[dudewhensmydat]

does changing temperature change equilirium constant and solubility constant? If so, why? Is there en euqation to prove it? Thanks!

Thanks!

Yup - I agree with the latest posters...a change in temperature DOES alter the position of Keq. Changing the pressure, volume, or concentration (as wells as adding a catalyst) does NOT, however.

I read this info in Kaplan and Schaum's.

 

[doc toothache]

The equation is

(delta)G=-RTlnKeq

where (delta)G is the standard free energy difference between products and reactants, T is the temperature in kelvis, and R is the universal gas constant.
ln (natural log).

The equilibrium constant depends on the temperature, and on other variables such as pH, other co-solvents, which influence the standard free energy.

 

[blue_moon01]

i think this is one of the colligative property question.. they cover it up pretty well but that's what it comes down to...DAT almost always have a couple questions on those so you should familiarize yourself with them colligative properties.