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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):
H
5
IO
6
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:
[
Ref.1
,
Ref.2
]
Ba
3
(H
2
IO
6
)
2
+ 6HNO
3
→ 2H
5
IO
6
+ 3Ba(NO
3
)
2
Reactions:
[
Ref.1
]
H
5
IO
6
+ 3NaOH → Na
3
H
2
IO
6
+ 3H
2
O
Yeild 100%. [
Ref.1
,
Ref.2
]
HOCH
2
(CHOH)
4
CHO + 5H
5
IO
6
→ CH
2
O + 5HCOOH + 5HIO
3
+ 10H
2
O
Yeild 100%. [
Ref.1
]
HOOCCH(OH)CH(OH)COOH + H
5
IO
6
→ 2HOOCCHO + HIO
3
+ 3H
2
O
Yeild 100%. [
Ref.1
]
HOCH
2
(CHOH)
4
CH
2
OH + 5H
5
IO
6
→ 2CH
2
O + 4HCOOH + 5HIO
3
+ 11H
2
O
Yeild 100%. [
Ref.1
]
HOCH
2
(CHOH)
4
CHO + 5H
5
IO
6
→ CH
2
O + 5HCOOH + 5HIO
3
+ 10H
2
O
[
Ref.1
]
HOCH
2
(CHOH)
4
COOH + 4HIO
4
→ CH
2
O + 3HCOOH + OHCCOOH + 4HIO
3
+ H
2
O
Electrode potential:
H
5
IO
6
+ H
+
+ 2e
-
→ IO
3
-
+ 3H
2
O, E = 1.6 V (water, 25°C)
Dissociation:
pK
a
(1) = 1.51 (25°C, water)
pK
a
(2) = 8.15 (25°C, water)
pK
a
(3) = 12.6 (16°C, water)
Standard molar enthalpy (heat) of formation Δ
f
H
0
(298.15 K, kJ/mol):
-761.5 (s)
References:
Inorganic Syntheses. - Vol. 1. - New York and London, 1939. - pp. 172-175
Некрасов Б.В. Основы общей химии. - Т.1. - М.: Химия, 1973. - pp. 284 [Russian]
Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 65 [Russian]
Успехи химии. - 1968. - Т.37, №4. - pp. 543-544 [Russian]
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© Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru
, Ref.2
]
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