Four 100 mL buffer solutions are prepared at 25 °C.
Solution I 0.10 M HA and 0.10 M A⁻
Solution II 0.50 M HA and 0.10 M A⁻
Solution III 0.50 M HA and 0.50 M A⁻
Solution IV 0.10 M HA and 0.50 M A⁻
After 0.010 mol of solid NaOH is added to each solution, which solution will experience the smallest change in pH?
a) Solution II
b) Solution III
c) Solution I
d) Solution IV