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苯酚的酸性又小於碳酸,所以往苯酚鈉溶液中吹入二氧化碳,又可以得到碳酸氫鈉和苯酚
碳酸的酸性比苯酚强,苯酚酸性比碳酸氫根的强.固名俗名為石炭酸. 囙此苯酚鈉和CO2,H2O反應生成碳酸氫鈉,而不能生成碳酸鈉,這是遵守了,強酸制弱酸的定理.
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