在氨水中加入适量 HCl 溶液可用来配制 pH = 9.0 的缓冲溶液(已知氨水的 p K b = 4.75 ),则此缓冲溶液的抗碱成分是
A.
NH 3
B.
HCl
C.
H 2 O
D.
NH 4 +
E.
H 3 O +
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举一反三
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