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Buffer Solution and Henderson-Hasselbalch (H-H)

What is the pH of a solution prepared by mixing 50.00mL of 0.10 M NH3 with 25.00mL of 0.10 M NH4Cl? Assume that the volume of the solutions are additive and that Kb= 1.8 x 10 -5 for NH3.

What is the pH of a solution made by mixing 30.00mL of 0.10M acetic acid with 30.00mL of 0.10 M KOH? Assume that the volumes of the solutions are additive. Ka=1.8 x 10-5 for CH3CO2H.

What is the pH of a solution prepared by mixing 25.00mL of 0.10 M Ch3CO2H with 25.00mL of 0.050 M CH3CO2Na? Assume that the volume of the solutions are additive and that Ka=1.8 x 10-5 for CH3CO2H.

For the reaction 3C2H2(g) yields C6H6(l) at 25 degrees Celcius, the standard enthalpy change is -631 kJ and the standard entropy change is -430 J/K. Calculate the standard free energy change at 25 degrees Celcius.

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