Ochem question!!

[blamb]

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Hey,

I know that strong acids have higher Ka (lower pka), but how does Ka relate to solubility (if it does at all)?? Hope that made sense

Thanks🙂

 

[wantVCUdental]

Hey,

I know that strong acids have higher Ka (lower pka), but how does Ka relate to solubility (if it does at all)?? Hope that made sense

Thanks🙂

It doesn't really relate to solubility, Ka is a constant to measure the dissociate of a proton from an acid. Solubility is measuring dissociation in water...
a substance can be soluble/dissolved in water but it may not necessarily dissociate. so its ksp maybe big, but its ka very small.
Hope that helps

 

[blamb]

Thanks wantVCUdental,

I asked because I believe I saw a question like that on some practice test? A list of substances was given with its pka or Ka values and they asked which one is most soluble? Maybe they had those values to throw me off and I should have just used my knowledge of the solubility rules? But I believe all of them were soluble to some degree..so I dunno..

 

[mx41]

Soluble in what? Water? Ethanol?
The question is too vague, just asking which is more soluble is not sufficient to answer the question.

And I agree with the first person who replied, Ka and solubility aren't so much related (are you sure you don't mean Ksp?)
The only thing I can think of is that it gives you a solvent, and it lists you solutes and from there you can see which one is polar/nonpolar. Polar substances will dissolve in polar solvents, and nonpolar substances will dissolve in nonpolar solvents.

 

[wantVCUdental]

Thanks wantVCUdental,

I asked because I believe I saw a question like that on some practice test? A list of substances was given with its pka or Ka values and they asked which one is most soluble? Maybe they had those values to throw me off and I should have just used my knowledge of the solubility rules? But I believe all of them were soluble to some degree..so I dunno..

I believe they are trying to throw you off

 

[blamb]

Thank you, I didnt think they were related thats why I thought something was wrong with the question or maybe I misread it. And yes I meant to say soluble in water...