University of Houston Undergrad Aquatic Chemistry Questions

1. Calculate the pH of a water open to the atmosphere where Ctand alkalinity are approximately equal
at 1.6 x 10-3 eq/L assuming carbonate to be the only weak acid. Show all work and list all assumptions.
Solve algebraically or use PC-pH graph. (7)
2. Calculate the pH of a natural water with an alkalinity of 1 x 10-4 eq L-1 at equilibrium with an atmosphere
having a Pco2 = 10-3.5 atm. Show all work for full credit. (8)
Reactions H2O = H+ + OH pkw = 14
CO2(g) + H2O = H2CO3* pKH = 1.5
H2CO3 = H+ + HCO3 PK1 = 6.3
HCO3 = H+ + CO32 pk2 = 10.3
3. Calculate the alkalinity of a solution having the following recipe. Assume only the carbonate system is
important. Pco2 = 10-3.5, pH = 7.3. Show all work for full credit. (9)
4. What is the pH of a solution having the following recipe? Assume open system, Pco2 = 10-3.5 atm.
Show all work for full credit. Assume HCl is a strong acid. (10)
Recipe: [Na2CO3) = 10-3, [HCI] = 10-

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