If a small amount of a strong base is added to buffer made up of a weak acid,HA,and the sodium salt of its conjugate base,NaA,the pH of the buffer solution does not change appreciably because
A) the Ka of HA is changed.
B) No reaction occurs.
C) the strong base reacts with A- to give HA,which is a weak acid.
D) the strong base reacts with HA to give AOH and H+.
E) the strong base reacts with HA to give A- which is a weak base.
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