取弱酸或弱鹼溶液分別加入強鹼或強酸，可配製不同 pH 值的緩衝溶液。在 25oC 時，下列哪一個弱酸或弱鹼最適合配製 pH 0～5 的緩衝溶液?(A)HNO2 (Ka = 5✕10

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46. 取弱酸或弱鹼溶液分別加入強鹼或強酸，可配製不同 pH 值的緩衝溶液。在 25oC 時，下列哪一個弱酸或弱鹼最適合配製 pH 9.0～9.5 的緩衝溶液?
(A)HNO2 (Ka = 4.5✕10‒4)
(B)CH3COOH (Ka = 1.8✕10‒5)
(C)HOCl (Ka = 3.2✕10‒8)
(D)NH3 (Kb = 1.8✕10‒5)

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