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Junior High
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14.欲透過右圖的裝置來檢測未知濃度 HC 2的鹽酸。若選用酚酞做為酸鹼指示 劑,將已知濃度的氫氧化鈉水溶液置 www N 入滴定管中,進行酸鹼中和的滴定實 驗,則有關此實驗的敘述,下列何者 甲 正確? (A)滴定前,先將酚酞指示劑滴在滴定管中 (B)滴定過程中,錐形瓶内溶液的pH值逐漸變小 (C) 滴定過程中,錐形瓶内溶液的[C]逐漸變小 (D)當酚酞指示劑的顏色由紅色變為無色,表示已
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