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Properties of substance:

periodic acid

Group of substances:

inorganic

Physical appearance:

colorless monoclinic crystals

Empirical formula (Hill's system for organic substances):

H5IO6

Structural formula as text:

H5IO6

Molar/atomic mass: 227.94

Melting point (°C):

122

Decomposition temperature (°C):

123

Solubility (g/100 g of solvent):

diethyl ether: soluble [Ref.]
ethanol: soluble [Ref.]
nitric acid 72%: 5.68 (-12°C) [Ref.]
nitric acid 72%: 7.82 (26°C) [Ref.]
water: very soluble [Ref.]

Hygroscopic:

yes

Reactions of synthesis:

  1. [Ref.1aster, Ref.2aster]
    Ba3(H2IO6)2 + 6HNO3 → 2H5IO6 + 3Ba(NO3)2

Reactions:

  1. [Ref.1]
    H5IO6 + 3NaOH → Na3H2IO6 + 3H2O
  2. Yeild 100%. [Ref.1, Ref.2]
    HOCH2(CHOH)4CHO + 5H5IO6 → CH2O + 5HCOOH + 5HIO3 + 10H2O
  3. Yeild 100%. [Ref.1]
    HOOCCH(OH)CH(OH)COOH + H5IO6 → 2HOOCCHO + HIO3 + 3H2O
  4. Yeild 100%. [Ref.1]
    HOCH2(CHOH)4CH2OH + 5H5IO6 → 2CH2O + 4HCOOH + 5HIO3 + 11H2O
  5. Yeild 100%. [Ref.1]
    HOCH2(CHOH)4CHO + 5H5IO6 → CH2O + 5HCOOH + 5HIO3 + 10H2O
  6. Yeild 45%. [Ref.1aster]
    2C6H6 + 3H5IO6 + 9HI → 2C6I6 + 18H2O
  7. [Ref.1]
    HOCH2(CHOH)4COOH + 4HIO4 → CH2O + 3HCOOH + OHCCOOH + 4HIO3 + H2O

Electrode potential:

H5IO6 + H+ + 2e- → IO3- + 3H2O, E = 1.6 V (water, 25°C)

Dissociation:

pKa (1) = 1.51 (25°C, water)
pKa (2) = 8.15 (25°C, water)
pKa (3) = 12.6 (16°C, water)

Standard molar enthalpy (heat) of formation ΔfH0 (298.15 K, kJ/mol):

-761.5 (s)

References:

  1. Inorganic Syntheses. - Vol. 1. - New York and London, 1939. - pp. 172-175
  2. Некрасов Б.В. Основы общей химии. - Т.1. - М.: Химия, 1973. - pp. 284 [Russian]
  3. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 65 [Russian]
  4. Успехи химии. - 1968. - Т.37, №4. - pp. 543-544 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru