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在日常的工作中,我們发現用常水或蒸餾水配制10%碘化鉀溶液剂时,曾得出不同的結果:用煑后的常水配制时,虽經放置,并未发現有顏色的变化;当改用蒸餾水配制时,則立即有明显的黄色;用煑沸后的蒸餾水配制时,当时虽无变化,但稍微久置,亦立即变黄。根据上述情况,我們对所用的四种不同的水,进行了pH检查,并以这四种水做溶媒,分別配制成10%的碘化鉀溶液,放置,加入淀粉試液,观察有无游离碘析出,其結果如表1。为了进一步証明pH对碘化鉀溶液中析出游离碘的影响,曾采用9种不同pH值的
In our daily work, we found different results when formulating 10% potassium iodide solution with either normal or distilled water: no change in color was found when placed on top of normal water, Use distilled water preparation, then immediately obvious yellow; boiled with boiling water after the preparation, although no change at that time, but slightly longer set, also immediately turn yellow. According to the above situation, we conducted a pH check on the four different kinds of water used, and used the four kinds of water as the solvent to prepare 10% potassium iodide solution respectively, placed and added starch test solution to observe whether the free iodine was precipitated, The results are shown in Table 1. In order to further prove the effect of pH on the free iodine precipitation in potassium iodide solution, nine different pH values