2、用碳酸钠作基准物标定盐酸溶液时 为什么不用酚酞作指示剂
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2、用碳酸钠作基准物标定盐酸溶液时 为什么不用酚酞作指示剂
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WebSep 26, 2010 · 因为用酚酞作指示剂,变色时(PH=9左右)碳酸钠是被滴定成碳酸氢钠,它具有一定的两性(缓冲作用),突跃不大,变色不明显,所以一般都用甲基橙之类的指 … WebJun 1, 2015 · 2011-04-08 用碳酸钠作基准物标定盐酸时,为什么要用甲基橙作指示剂 31 2014-09-24 用碳酸钠为基准物质标定盐酸溶液时,为什么不用酚酞做指示剂 2009-06-05 如何用 …
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