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Is iodine water acidic or alkaline? Why?
Good evening. Iodine in iodine water disproportionates with water to generate hypoiodic acid. To put it bluntly, it is an aqueous solution of hypoiodic acid. Its appearance is yellow, it is an acidic aqueous solution with strong oxidation. After adding formaldehyde, it can be reduced and faded to colorless and transparent. As for why iodine water is alkaline, it is a joke. Without exception, the old PH test paper is used to measure this phenomenon. The reference substance of this kind of test paper will react with hypoiodic acid to produce light green substance, which makes the identification result biased. If it is replaced by an electronic PH high-precision counter, it will show the correct weak acid value-there are many similar stems in organic chemistry, such as petroleum ether is not an ether (alkane mixture, it has no ether group), ornithine is not an acid (amino strength), whether the iodine solution is alkaline or not, and adding a few drops of phenolphthalein will not change color. The alkaline iodine solution downstairs is copying someone else's disproportionation table, and that pH >;; 9 is the critical point of intensified disproportionation of iodine water, not the PH value of iodine water. ...
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