Question

Calculate the pH of a buffer solution containing 0.100 mol HC₂H₃O₂ and 0.100 mol NaC₂H₃O₂ per liter of solution (Ka = 1.8 x 10⁻⁵) after the addition of 0.015 mol NaOH.

Answer 1

The pH of a buffer solution can be calculated using the Henderson-Hasselbalch equation, which takes into account the acid and the conjugate base concentrations. After neutralization with NaOH, the new concentrations can be calculated and plugged into the equation to determine the pH of the buffer solution.

Step-by-step explanation:

The pH of a buffer solution can be calculated using the Henderson-Hasselbalch equation, which is given by:

pH = pKa + log([A-]/[HA])

In this case, the acid is HC2H3O2 and the conjugate base is C2H3O2-. The pKa value is given as 1.8 x 10^-5. After the addition of NaOH, which is a strong base, the HC2H3O2 will be neutralized and converted to C2H3O2-. The new concentrations can be calculated using the given information. Plugging the values into the Henderson-Hasselbalch equation will give the pH of the buffer solution.