Posted by Justine on .
A buffer consists of 0.14 M KHCO3 and 0.61 M K2CO3. Carbonic acid is a dirpotic acid with Ka1= 4.5*10^-7 and Ka2= 4.7*10^-11.
a) which Ka value is more important to this buffer
b) what is the buffer pH?
Look at the constituents of k1 and k2 and choose the one that matches the reaction.
You have HCO3^- and CO3^2- in the problem.
Write k1 and k2 expressions. Then determine which one has HCO3^- and CO3^2- in it.