I know this might seem like a simple question, but I've spent a couple of days trying to get an answer that will satisfy my thesis examiner.
I have extracted some plant cell wall material in a series of solutions of KOH with increasing concentrations (0.5M, 1.0M and 4.0M), the resulting residue was then extracted in 4.0M NaOH. I measured the concentration of certain alkali-releasable compounds in my extracts and found that although the residue had already been extracted in 4.0M KOH the 4.0M NaOH released some as well. Previously I had assumed NaOH and KOH were interchangeable strong bases, but it appears not, so now I'm assuming NaOH is a stronger base. I have a reference that says both NaOH and KOH are "strong" bases, ie pKb less than zero, but I've also seen the Chem buddy thing that says NaOH (pKb=0.2) is stronger than KOH (pKb=0.5). I was hoping someone might be able to give me a more reliable reference that states this, as NaOH being stronger would seem to explain my results nicely.
If anyone can think of a better reason, shoot.