用重铬酸钾基准试剂标定硫代硫酸钠溶液时,为什么要加入过量的碘化钾固体和盐酸溶液?为什么要放置一定时间后才加入水稀释?下列三种分别对标定有和影响?(1)加碘化钾溶液而不加盐酸
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![用重铬酸钾基准试剂标定硫代硫酸钠溶液时,为什么要加入过量的碘化钾固体和盐酸溶液?为什么要放置一定时间后才加入水稀释?下列三种分别对标定有和影响?(1)加碘化钾溶液而不加盐酸](/uploads/image/z/3448452-12-2.jpg?t=%E7%94%A8%E9%87%8D%E9%93%AC%E9%85%B8%E9%92%BE%E5%9F%BA%E5%87%86%E8%AF%95%E5%89%82%E6%A0%87%E5%AE%9A%E7%A1%AB%E4%BB%A3%E7%A1%AB%E9%85%B8%E9%92%A0%E6%BA%B6%E6%B6%B2%E6%97%B6%2C%E4%B8%BA%E4%BB%80%E4%B9%88%E8%A6%81%E5%8A%A0%E5%85%A5%E8%BF%87%E9%87%8F%E7%9A%84%E7%A2%98%E5%8C%96%E9%92%BE%E5%9B%BA%E4%BD%93%E5%92%8C%E7%9B%90%E9%85%B8%E6%BA%B6%E6%B6%B2%3F%E4%B8%BA%E4%BB%80%E4%B9%88%E8%A6%81%E6%94%BE%E7%BD%AE%E4%B8%80%E5%AE%9A%E6%97%B6%E9%97%B4%E5%90%8E%E6%89%8D%E5%8A%A0%E5%85%A5%E6%B0%B4%E7%A8%80%E9%87%8A%3F%E4%B8%8B%E5%88%97%E4%B8%89%E7%A7%8D%E5%88%86%E5%88%AB%E5%AF%B9%E6%A0%87%E5%AE%9A%E6%9C%89%E5%92%8C%E5%BD%B1%E5%93%8D%3F%EF%BC%881%EF%BC%89%E5%8A%A0%E7%A2%98%E5%8C%96%E9%92%BE%E6%BA%B6%E6%B6%B2%E8%80%8C%E4%B8%8D%E5%8A%A0%E7%9B%90%E9%85%B8)
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