中考复习—石蕊试液和酚酞试液遇到氢氧化铁会变色吗？
侯英超 |
发布日期：2010-06-09 06:00:49
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不会。酸碱指示剂只有遇到酸溶液或碱溶液时才会改变颜色。大多数的酸都是溶于水的，而碱则不同，只有少数碱是能够溶于水的，如：氢氧化钾 (KOH)、氢氧化钠(NaOH)、氢氧化钡〔Ba(OH)2)和氢氧化钙〔Ca(OH)2〕。当石蕊和酚酞遇到它们的水溶液时会变色，而氢氧化铁 〔Fe(OH)3〕等是不能溶于水的碱，所以石蕊和酚酞不会变色。 |
