A mixture of Na2CO3 and NaHCO3 has a massof 81.2 g. It is dissolved in 1.00 L of water and the
pH is found to be 9.92.
Find the mass of NaHCO3 in the mixture.
Express your answer with the appropriate units.
MISSED THIS? Read Section
17.9 (Pages 765 – 769).
Consider a 0.11 M solution of a weak polyprotic
acid (H2A) with the possible values of Kal and
Ka2 given here. Calculate the contributions to
[H3O+] from each ionization step. At what point
can the contribution of the second step be
Kal = 1.0 x 10-4 and K22 = 5.0 x 10-5
Express your answers in molarity to two significant figures separated by a comma.
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