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外観
白色, 結晶～結晶性粉末
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溶解性
冷水に微溶, 熱水に易溶。水に溶けにくく、エタノールにほとんど溶けない。
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化学的特性
colourless crystals or white crystalline powder
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物理的性質
Colorless tetragonal crystals; density 3.618 g/cm3; melts at 582°C; slightly soluble in water at ordinary temperatures, 0.42 g/100mL at 20°C; moderately soluble in hot water, 4.4 g/100mL at 80°C.
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使用
For the colorimetric determination of Mn (oxidizes manganese compounds to permanganates), as oxidizing agentPotassium periodate is used as an oxidizing agent in organic synthesis and an analytical reagent for the determination of potassium and cerium. It is also used in colorimetric estimation of manganese. It reacts with ammonium cerium(IV) nitrate to prepare tris[trinitratocerium(IV)] paraperiodate which finds application as an oxidant.
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製造方法
Potassium periodate can be prepared by oxidation of potassium iodate with a powerful oxidizing agent such as potassium permanganate, chlorine or bromine in basic solution:
IO3ˉ+ Cl2+ 2OHˉ→IO4ˉ+ 2Clˉ+ H2O
Also, the salt may be prepared by electrolysis.
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調製方法
Potassium periodate, KlO4, white solid, formed by electrolysis of potassium iodate under proper conditions.
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一般的な説明
Potassium (meta)periodate exhibits strong oxidizing properties in acidic medium.
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危険性
Fire risk in contact with organic materials,
strong oxidizing agent. Strong irritant to tissue.
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純化方法
Crystallise it from distilled water. Its solubility in H2O is 0.2% at 0o, 0.4% at 20o, 4.4% at 80o. and 7.9% at 100o. [Hill Inorg Synth I 171 1939, Schmeisser in Handbook of Preparative Inorganic Chemistry (Ed. Brauer) Academic Press Vol I p 325 1963.]
