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強酸制弱酸原則,苯酚酸性比碳酸的酸性弱,但比HCO3-的酸性强.所以苯酚鈉與二氧化碳反應生成碳酸氫鈉.
有一個原因是因為碳酸鈉和碳酸氫鈉的溶解度不同.還有一個原因是因為,生成碳酸氫鈉的過程,需要消耗溶劑的質量,使得碳酸氫鈉結晶析出.
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