the pH of 0.10 M and 0.40 M NaHCO₃(aq)solutions is 8.31 for both?

Question

Quizplus · Accepted Answer

NaHCO3 is a weak base, and when it dissolves in water, it forms HCO3- (bicarbonate) ions and Na+ ions. The pH of the resulting solution will depend on the concentration of HCO3- ions. However, at a concentration of 0.10 M or 0.40 M, the concentration of HCO3- ions is not high enough to significantly affect the pH of the solution. Therefore, the pH of both solutions is approximately equal to the pKa of HCO3- (6.35), which is 8.31 at room temperature. Since the concentration of Na+ ions is the same in both solutions, the pH is also the same.

The PH of 0