A 1.0-L buffer solution contains 0.100 mol HC 2 H 3 O 2 and 0.100 mol NaC

Question:

A 1.0-L buffer solution contains 0.100 mol HC₂H₃O₂ and 0.100 mol NaC₂H₃O₂. The value of Ka for HC₂H₃O₂ is 1.8 * 10^-5. Because the initial amounts of acid and conjugate base are equal, the pH of the buffer is equal to pK_a = -log(1.8 * 10^-5) = 4.74. Calculate the new pH after adding 0.010 mol of solid NaOH to the buffer. For comparison, calculate the pH after adding 0.010 mol of solid NaOH to 1.0 L of pure water.