Solvation and Ksp value

[DingDongD]

So, in EK chemistry book, they mentioned that for solvation reactions, even if temperature increases for a exothermic reaction, solubility increases. Does that basically mean that Ksp increases? This is due to entropy.

My other questions is that would this be the case for all reactions? Why would it be limiting only for solvation reactions?

Such as N2O2 (g) -> 2NO4 (g), even though this is an exothermic reaction, would Keq increase as temp increase? I know it does not, but I cannot understand the difference between these two.

Thank you ahead.

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[aldol16]

Such as N2O2 (g) -> 2NO4 (g), even though this is an exothermic reaction, would Keq increase as temp increase? I know it does not, but I cannot understand the difference between these two.

Remember that Keq is dependent on temperature. See the van't Hoff equation.

 

[NextStepTutor_2]

So, in EK chemistry book, they mentioned that for solvation reactions, even if temperature increases for a exothermic reaction, solubility increases. Does that basically mean that Ksp increases? This is due to entropy.

My other questions is that would this be the case for all reactions? Why would it be limiting only for solvation reactions?

Such as N2O2 (g) -> 2NO4 (g), even though this is an exothermic reaction, would Keq increase as temp increase? I know it does not, but I cannot understand the difference between these two.

Thank you ahead.

No reaction condition save Temperature will affect equilibrium constants. Generally as T increases, K increase. The same is true for our pH scale, its only valid at standard conditions. If you raise the T of water you lower its pH but it's not acidic, because at the new T the kw is a new value.

Hope this helps, good luck!

 

[David513]

Careful: the solubility of solids increases with an increase in temperature, but the solubility of gases DECREASES with an increase in temperature. Two examples that help me remember this are adding salt to boiling water (when making pasta) and leaving an open can of Coke out in the sun. If you add salt to boiling water it dissolves very efficiently (vs. adding it to super cold water). However, your Coke gets flat very quickly (i.e. the CO2 gas doesn't stay dissolved in the liquid) if you accidentally heat it up by leaving it out in the sun.

 

[David513]

... on a second reading I'm not sure my answer is helpful for the question you had. ¯\_(ツ)_/¯ As you were!