pH of a buffer does not change remarkably with dilution . Why?

Buffers against pH changes are

pH of an acid buffer is given by

The pH of a buffer solution remains almost same on dilution - explain.

This question has statement I and Statement II. Of the four choices given after the Statements, choose the one that best describes the two Statements. Statement-I: pH value of acidic buffer solution change, if buffer solution is diluted upto very larger extent. Statement-II : [H^+] decrease due to change in concentration as well as alpha and decrease in concentration is more as compared to increase in alpha

The pH of a buffer solution obtained by the combination of a weak base (B) and its conjugate acid (BH^+) is 9. If the concentrations of B and BH^+ in the buffer are 0.2(M) and 0.02(M) respectively, then find the ionisation constant of the weak base.

Why is it that the instantaneous rate of a reaction does not change when a part of the reacting solution is taken out?

The pH of 1L of a buffer obtained by the combination of a weak acid (HA) and its salt (NaA) is 5.0. What will be the ionisation constant of HA if the concentrations of HA and NaA in the buffer are 0.3 (M) and 0.4 (M) respectively?