Comparing PH values for different concentrations.?

Question

How does the pH of a 0.20 M solution of NaHCO3 compare to that of a 0.10 M solution of NaHCO3?


A. It is 2 times as high.
B. It is half as much.
C. It is the same.
D. cannot be determined with the Ka values
E. none of these

Answer 1

the pH cannot be determined WITHOUT the Ka values, since it is a weak amphiprotic salt (you need Ka1 and Ka2)

So if you typed the possible answers correctly the anwer is
E. none of these