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Anorganic Chem Q

- Wed, 18 Jan 2017 06:14:04 EST +xNTZBER No.78473
File: 1484738044507.png -(1001768B / 978.29KB, 734x1088) Thumbnail displayed, click image for full size. Anorganic Chem Q
So me and my colleague are arguing about whether KOH or NaOH is stronger base. While in practice it is not important, I'd argue that theoretically it must be KOH, as the enthalpy of K+ is lower, therefore KOH will be more likely to dissociate. However, the colleague is buzzing around with a dubious Pkbn from chembuddy which states that pKbn values for NaOH and KOH are 0.2 and 0.5 respectively, indicating that NaOH would in fact be a stronger base (and LiOH the strongest). Why would that be? Pls explain. pic unrel
Bombastus !uYErosQbLM!!Mybq1UbK - Thu, 19 Jan 2017 23:37:12 EST Req4jw5M No.78475 Reply
Electron density is spread out in potassium compared to sodium. This is why potassium carbonate is slightly soluble in acetone compared to sodium and why you see cesium carbonate used in research papers.
The same holds true for hydroxides.
Charlotte Drablingspear - Fri, 27 Jan 2017 22:02:40 EST klMiQ9iI No.78512 Reply
Any difference between the two is likely very small, but I would have to say that NaOH is stronger because Na is less electronegative than K, so it is more willing to give up that OH group. Pure speculation tho
Bombastus !uYErosQbLM!!Mybq1UbK - Sat, 28 Jan 2017 01:26:18 EST ViNIYyYK No.78513 Reply
You are right but that's a product, not a reason. The question is WHY it is more electronegative than potassium and the answer is ironic radius trends.

Where my electrons @@@@@@@@@?
Eliza Grandwill - Sat, 28 Jan 2017 02:36:32 EST vukMbHQH No.78515 Reply

That logic makes no sense to me; I would expect Potassium to be more likely to give up the ghost due it its relatively large electron cloud. The distance of the periphery of the electron cloud to the center of the atoms nucleus should allow easier access to its valence electrons, no?

Which is why pure cesium reacts so violently in water in comparison to lithium, sodium, and potassium.

I guess what I'm saying is NaOH being stronger than KOH goes against my intuition.
Eliza Grandwill - Sat, 28 Jan 2017 02:41:50 EST vukMbHQH No.78516 Reply
Nvm, I gets it.

The ionic association of potassium is stronger than sodium with anions, so you would expect less dissociation as the alkali metals get heavier.

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