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Periodic acid (/ ˌ p ɜːr aɪ ˈ ɒ d ɪ k / per-eye-OD-ik) is the highest oxoacid of iodine, in which the iodine exists in oxidation state +7. It can exist in two forms: orthoperiodic acid, with the chemical formula H 5 IO 6 , and metaperiodic acid, which has the formula HIO 4 .
Orthoperiodic acid, H 5 IO 6, is stable, and dehydrates at 100 °C in a vacuum to Metaperiodic acid, HIO 4. Attempting to go further does not result in the nonexistent iodine heptoxide (I 2 O 7), but rather iodine pentoxide and oxygen. Periodic acid may be protonated by sulfuric acid to give the I(OH) + 6 cation, isoelectronic to Te(OH) 6 and ...
A mnemonic is a memory aid used to improve long-term memory and make the process of consolidation easier. Many chemistry aspects, rules, names of compounds, sequences of elements, their reactivity, etc., can be easily and efficiently memorized with the help of mnemonics.
Sodium periodate is an inorganic salt, composed of a sodium cation and the periodate anion.It may also be regarded as the sodium salt of periodic acid.Like many periodates, it can exist in two different forms: sodium metaperiodate (formula NaIO 4) and sodium orthoperiodate (normally Na 2 H 3 IO 6, but sometimes the fully reacted salt Na 5 IO 6).
The reaction of periodic acid oxidizes vicinal diols in these sugars, usually breaking up the bond between two adjacent carbons not involved in the glycosidic linkage or ring closure in the ring of monosaccharide units that are part of the long polysaccharides and creating a pair of aldehydes at the two free tips of each broken monosaccharide ...
Diiodine pentoxide (I 2 O 5) is the anhydride of iodic acid and the only stable anhydride of an iodine oxoacid. Tetraiodine nonoxide (I 4 O 9) has been prepared by the gas-phase reaction of I 2 with O 3 but has not been extensively studied. [11]
Holmium iodate is an inorganic compound with the chemical formula Ho(IO 3) 3. It can be obtained by reacting holmium periodate and periodic acid in water at 170 °C. [1] Its solubility in water is 1.162±0.001 (25 °C, 103 mol·dm −3). Adding ethanol or methanol to water will reduce the solubility. [2]
The reactions are exothermic and are typically performed at 0 °C. As periodate salts are only readily soluble in water reactions are generally performed in aqueous media. Where solubility is an issue periodic acid may be used, as this is soluble in alcohols; phase transfer catalysts are also effective in biphasic reaction mixtures.