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是化學變化,生成CO2和醋酸鈉
是石蕊和酚酞等酸堿指示劑變色. 酸堿指示劑一般是弱的有機酸或有機堿,它的酸式與其共軛堿式相比應具有明顯不同的色調.當溶液的pH改變時,指示劑失去質子由酸式轉變為堿式,或得到質子由堿式轉變為酸式,由於結構上的改變,從而引起顏失色的變化.
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