To predict the outcome of a school project, our group requires many constants, most of which can be found in tables on the internet. Two of the values we need are the dissociation (or ionization) constants of acetic acid and sodium bicarbonate, respectively. We were able to find the dissociation constant of acetic acid, and many other substances, in tables like these: http://clas.sa.ucsb.edu/staff/Resource%20folder/Chem109ABC/Acid,%20Base%20Strength/Table%20of%20Acids%20w%20Kas%20and%20pKas.pdf. However, the dissociation constant for sodium bicarbonate could not be found anywhere after hours of searching. It is unclear whether this value can be calculated, or if it can only be found through experimenting. If anyone knows how to calculate this value or where to find it, it would be a huge help!

That's because there's no protons to dissociate. Look up the pKb of carbonate or look up the Ka of HCO3-.

The dissociation of NaHCO3 into Na⁺ and HCO3^- ions is essentially complete when it dissolves.

 

But the dissociation of the HCO3^- into H+ and CO3^2- isn't.