A groundwater aquifer(closed-system) with no exchange with the atmosphere. Some people have measured 2 main underground rivers as the main inputs for the system, and it can be assumed that the initial species that will form the aquifer are 10-4 M HAc (pKa = 4.76), 10-4 M NH4Cl (pKa = 9.25), 10-3 M NaHCO3, and 10-3 M Na2CO3 (pKa1 = 6.35, pKa2 = 10.33).
Calculate the pH of the aquifer and the speciation.
At what pH range will this water be well buffered?

Question

A groundwater aquifer(closed-system) with no exchange with the atmosphere. Some people have measured 2 main underground rivers as the main inputs for the system, and it can be assumed that the initial species that will form the aquifer are 10-4 M HAc (pKa = 4.76), 10-4 M NH4Cl (pKa = 9.25), 10-3 M NaHCO3, and 10-3 M Na2CO3 (pKa1 = 6.35, pKa2 = 10.33).
 Calculate the pH of the aquifer and the speciation.
At what pH range will this water be well buffered?

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