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In which of the following cases can the pH be determined using the equilibrium constant(s) provided?

1. A mixture containing 0.1 M NH4Cl and 0.1 M NH4OH; Kb value for NH4OH
2. A solution with 0.1 M NH4+; Kb of NH3 and Kw
3. A solution containing 0.1 M CH3COOH and 0.2 M CH3COONa; Ka value for CH3COOH
4. A solution with 0.1 M CH3COONa; Ka for CH3COOH and Kw

Correct answer: A solution containing 0.1 M CH3COOH and 0.2 M CH3COONa; Ka value for CH3COOH

Solution

The pH of a solution containing a weak acid and its conjugate base can be determined using the Ka value of the acid, as the solution is a buffer and its pH can be calculated using the Henderson-Hasselbalch equation.

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