某酸鹼指示劑之 Ka = 0 x 10–5(pKa : 52), 其酸型態是紅色，鹼型態則為藍色，欲使指示劑由 80%的藍色轉變為 80%的紅色，溶液 pH 值必須為下列何情況：(A)

問題詳情

21. 某酸鹼指示劑之 Ka = 3.0 x 10–5(pKa : 4.52), 其酸型態是紅色，鹼型態則為藍色，欲使指示劑由 80%的藍色轉變為 80%的紅色，溶液 pH 值必須為下列何情況：
(A) 增加 1.2
(B) 減少 1.2
(C) 增加 0.75
(D) 減少 0.75

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