buffer capacity ( NH3 NH4+ )?

The buffer capacity of a solution is a measure of the amount of acid or base that the solution can absorb without a significant change in pH. What are the concentration of NH3 (aq) and NH4+ (aq) that will produce the maximum buffer capacity?

(Base dissociation constant Kb=1.8x10^-5 mol dm^-3)

NH3 NH4+

A 0.1 0.2

B 0.5 0.5

C 1.0 2.0

D 2.0 1.0

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