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Chloric acid

Chemical structure of chloric acid

Chloric acid is an inorganic compound with formula HClO3.

Table of contents
  1. 1Names
  2. 2Formulae and structures
  3. 3Properties
  4. 4Constituents
  5. 5Thermodynamic properties
  6. 6Solubility
  7. 7Hazards
  8. 8Preparations
  9. 9Chemical reactions
  10. 10References
  11. 11Related substances
  12. 12Related categories

Names

List of substance names

Nomenclature
Name
Typical name
Chloric acid
Compositional nomenclature
Hydrogen chlorate
Additive nomenclature
Hydroxidodioxidochlorine
Hydrogen nomenclature
Hydrogen(trioxidochlorate)

Formulae and structures

List of formulae

Formula name
Formula
Typical formula
HClO3
Molecular formula
HClO3
Compositional formula
HClO3
Structural formula
Chemical structure of chloric acid
Structural formula with no lone pair
Chemical structure of chloric acid with no lone pair
Other structural formulas
Chemical structure of chloric acid with double bonds
Chemical structure of chloric acid with double bonds and no lone pair
Lewis structure
Lewis structure of chloric acid
Colored Lewis structure
Colored Lewis structure of chloric acid

Properties

List of substance properties

Item
Value
Name
Chloric acid
Formula
HClO3
Appearance
Colorless aqueous solution
Odor
Odorless
Molar mass
84.46 g/mol
Density
1.282 g/cm3[1]
Aqueous solution, 20°C, 40% solution
Melting point
Boiling point

Constituents

Constituent atoms

AtomNameOxidation stateNumber
HHydrogen+11
ClChlorine+51
OOxygen−23

Ratio of atoms

AtomAtomic weightNumberAtomic ratioWeight ratio
H1.008120.00%1.19%
Cl35.45120.00%41.98%
O15.999360.00%56.83%
HClOAtomic ratio
ClOWeight ratio

Thermodynamic properties

Phase transition properties

Item
Value
Enthalpy of fusion
Enthalpy of vaporization
Enthalpy of vaporization at 25°C
Enthalpy of other transition

Standard thermodynamic properties

State
Standard enthalpy
of formation
ΔfH°
kJ · mol−1
Standard Gibbs
energy of
formation
ΔfG°
kJ · mol−1
Standard
molar entropy
S°
J · K−1 · mol−1
Standard molar
heat capacity at
constant pressure
Cp°
J · K−1 · mol−1
Ionized aqueous solution−103.97[2]−7.95[2]162.3[2]

Solubility

Qualitative solubility

Reactive
Miscible
Very soluble
Soluble
Slightly soluble
Very slightly soluble
Insoluble

Hazards

GHS label[3]

Physical hazards[3]

Health hazards[3]

Environmental hazards[3]

Preparations

Reaction of nonmetal and water

The reaction of chlorine and water yields chloric acid and hydrogen chloride.

Reaction of chlorine and water
ΔrG206.12 kJ/mol
K0.78 × 10−36
pK36.11

Electrolysis

Electrolysis of liquid can yield chloric acid.

Electrolysis of perchloric acid
ΔrG164.9 kJ/mol
K0.13 × 10−28
pK28.89

Chemical reactions

Electrolytic dissociation

Electrolytic dissociation of chloric acid yields hydrogen ion and chlorate ion.

Electrolytic dissociation of chloric acid
HClO3Chloric acid
H+Hydrogen ion + ClO3Chlorate ion

Reaction with base

The reaction of chloric acid and base yields salt.

Reaction with basic oxide

The reaction of basic oxide and chloric acid yields salt and water.

Reaction with salt of weak acid

The reaction of salt of weak acid and chloric acid yields salt of strong acid and weak acid.

Reaction with salt of volatile acid

The reaction of salt of volatile acid and chloric acid yields salt of non volatile acid and volatile acid.

Reaction with self-redoxing species

The reaction of self-redoxing species and chloric acid yields a variety of products.

Reaction with reducing species

The reaction of reducing species and chloric acid yields a variety of products.

Reaction of hydrogen and chloric acid
ΔrG−1494.9 kJ/mol
K7.86 × 10261
pK−261.90
Reaction of hydrogen and chloric acid
ΔrG−851.5 kJ/mol
K1.50 × 10149
pK−149.18
Reaction of hydrogen sulfide and chloric acid
ΔrG−1267.72 kJ/mol
K1.24 × 10222
pK−222.09
Reaction of manganese and chloric acid
ΔrG−1570.12 kJ/mol
K1.18 × 10275
pK−275.07
Reaction of tin and chloric acid
ΔrG−1733.5 kJ/mol
K4.97 × 10303
pK−303.70

Reaction with oxidizable species

The reaction of oxidizable species and chloric acid yields a variety of products.

Reaction with oxidizable species under acidic condition

The reaction of oxidizable species, chloric acid, and hydrogen ion yields a variety of products.

Reaction of copper and chloric acid under acidic condition
ΔrG−1079.42 kJ/mol
K1.28 × 10189
pK−189.11
5CuCopper + 2HClO3Chloric acid + 10H+Hydrogen ion
5Cu2+Copper(II) ion + Cl2Chlorine + 6H2OWater
Reaction of copper and chloric acid under acidic condition
ΔrG−907.07 kJ/mol
K8.16 × 10158
pK−158.91
10CuCopper + 2HClO3Chloric acid + 10H+Hydrogen ion
10Cu+Copper(I) ion + Cl2Chlorine + 6H2OWater
Reaction of potassium iodide and chloric acid under acidic condition
ΔrG−809.07 kJ/mol
K5.53 × 10141
pK−141.74
10KIPotassium iodide + 2HClO3Chloric acid + 10H+Hydrogen ion
10K+Potassium ion + 5I2Iodine + Cl2Chlorine + 6H2OWater

Reaction with oxidizing species

The reaction of chloric acid and oxidizing species yields a variety of products.

Reaction of chloric acid and oxygen
ΔrG−17.5 kJ/mol
K1.16 × 103
pK−3.07
Reaction of chloric acid and nitric acid
ΔrG−17.48 kJ/mol
K1.15 × 103
pK−3.06

Reaction with hardly oxidizable species

The reaction of hardly oxidizable species and chloric acid yields a variety of products.

Reaction with oxidizing species under acidic condition

The reaction of chloric acid, oxidizing species, and hydrogen ion yields a variety of products.

Reaction of chloric acid and potassium permanganate under acidic condition
ΔrG−276.0 kJ/mol
K2.25 × 1048
pK−48.35
5HClO3Chloric acid + 2KMnO4Potassium permanganate + 6H+Hydrogen ion
5HClO4Perchloric acid + 2Mn2+Manganese(II) ion + 3H2OWater + 2K+Potassium ion
Reaction of chloric acid and potassium permanganate under acidic condition
ΔrG−274.7 kJ/mol
K1.33 × 1048
pK−48.13

Reaction with hardly oxidizable species under acidic condition

The reaction of hardly oxidizable species, chloric acid, and hydrogen ion yields a variety of products.

Reaction of sodium chloride and chloric acid under acidic condition
ΔrG−47.30 kJ/mol
K1.93 × 108
pK−8.29
5NaClSodium chloride + HClO3Chloric acid + 5H+Hydrogen ion
🔥
5Na+Sodium ion + 3Cl2Chlorine + 3H2OWater
Reaction of sodium chloride and chloric acid under acidic condition
ΔrG−519.64 kJ/mol
K1.09 × 1091
pK−91.04
55NaClSodium chloride + 53HClO3Chloric acid + 13H+Hydrogen ion
🔥
42NaClO3Sodium chlorate + 13Na+Sodium ion + 33Cl2Chlorine + 33H2OWater
Reaction of gold and chloric acid under acidic condition
10AuGold + 6HClO3Chloric acid + 30H+Hydrogen ion
🔥
10Au3+Gold(III) ion + 3Cl2Chlorine + 18H2OWater
Reaction of gold and chloric acid under acidic condition
10AuGold + 2HClO3Chloric acid + 10H+Hydrogen ion
🔥
10Au+Gold(I) ion + Cl2Chlorine + 6H2OWater

Electrolysis of aqueous solution

Electrolysis of aqueous chloric acid yields a variety of products.

Electrolysis of aqueous chloric acid without water as reactant
ΔrG12.48 kJ/mol
K0.65 × 10−2
pK2.19
Electrolysis of aqueous chloric acid without water as reactant
ΔrG15.90 kJ/mol
K0.16 × 10−2
pK2.79
Electrolysis of aqueous chloric acid with water as oxidizing agent
ΔrG236.56 kJ/mol
K0.36 × 10−41
pK41.44
Electrolysis of water
ΔrG474.258 kJ/mol
K0.82 × 10−83
pK83.09
Electrolysis of aqueous chloric acid with water as reducing agent
ΔrG289.1 kJ/mol
K0.22 × 10−50
pK50.65

Decomposition

Decomposition of chloric acid yields a variety of products.

Decomposition of chloric acid
ΔrG−72.0 kJ/mol
K4.11 × 1012
pK−12.61
Decomposition of chloric acid
ΔrG27.7 kJ/mol
K0.14 × 10−4
pK4.85

References

List of references

  1. 1
    James G. Speight (2017)
    Lange's Handbook of Chemistry, 17th edition
    McGraw Hill Education

  2. 2
    Janiel J. Reed (1989)
    The NBS Tables of Chemical Thermodynamic Properties: Selected Values for Inorganic and C1 and C2 Organic Substances in SI Units
    National Institute of Standards and Technology (NIST)

  3. 3