Synthesis of potassium iodate

Preparation of potassium iodate

The chemical affinity of the halogens for hydrogen or positive elements decreases in passing from fluorine to iodine. However, the affinity for oxygen increases in this order, so that iodates and iodic acid (I2O5) are more stable than chlorates and chloric acid (Cl2O5). This fact could be applied for the following preparation.

Preparation of potassium iodate

Preparation of potassium iodate

31 grams of potassium chlorate are dissolved by warming in 100 ml of water and 36 grams of powdered iodine are added to the warm solution by preventing to escape of iodine vapor. 1 ml of 6N nitric acid is dropped to the flask and the flask is warmed gently until a brisk reaction commences. The reaction proceeds by filling the flask with violet vapors of iodine and if iodine starts to escape from the reaction flask, the reaction is slowed by dipping the flask for a moment in the cold water. After the reaction has moderated the solution is warmed until the iodine color has disappeared, and then boiled for about 10 minutes to expel most of the free chlorine. The solution now contains a considerable quantity of iodic acid in addition to the potassium iodate. In order to obtain potassium iodate, the solution is neutralized with potassium hydroxide until the neutral point is just reached. Finally, the solution is cooled, the crystals are collected by filtration. The additional portion of crop of crystals could be obtained by evaporation the filtrate. Potassium iodate is purified by dissolving the entire product in four times its weight of hot water, cooling, and collecting the crystals. Dried product is preserved in a stoppered bottle.

Synthetic inorganic chemistry, by A. A. Blanchard, 248-249, 1936





InChI Key


Canonical SMILES


MeSH Synonyms

potassium iodate

Depositor-Supplied Synonyms

POTASSIUM IODATE, 7758-05-6, Potassium triodate, Caswell No. 693A, Iodic acid, potassium salt, UNII-I139E44NHL, Potassium iodine oxide (KIO3), HSDB 1231, EINECS 231-831-9, Iodic acid (HIO3), potassium salt, EPA Pesticide Chemical Code 075703, NSC 215201, Potassium iodate solution, Iodic acid (HIO3), potassium salt (1:1), Potassium iodate standard solution, Potassiumiodate, potassium ion iodate, POSTASSIUM IODATE, ACMC-1BFQS, AC1Q1TXP, KSC377S2T, 30314_RIEDEL, 319392_ALDRICH, 34273_RIEDEL, 34274_RIEDEL, 38120_RIEDEL, 438464_ALDRICH, I139E44NHL, P3959_SIAL, 34273_FLUKA, 34274_FLUKA, 38120_FLUKA, 60386_FLUKA, 60390_FLUKA, CTK2H7929, 319392_FLUKA, JLKDVMWYMMLWTI-UHFFFAOYSA-M, MolPort-006-119-007, 30314_SIAL, 60390_SIAL, 207977_SIAL, 215929_SIAL, AKOS015853994, LS-3212, RL04984, TRA0014176, K356, AB1006869, TR-024779, 3B4-1863, I14-17281, 2893-83-6, 29183-64-0

Removed Synonyms

null, Potassium salt, Iodic acid, CID24448, C039693

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1 comment

  1. Azide

    As opposed to saying just “ml”, specify WHAT you are measuring? For example, here, I don’t know if you’re talking about water, Heptane, DCM, Acetone, etc! It would help out loads if specifications were added :^)

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