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Caesium iodate

Caesium iodate

Last updated: March 19, 2023

Caesium iodate is an inorganic compound with formula CsIO₃.

Table of contents

Names

List of substance names

Nomenclature

Name

Typical name: Caesium iodate

Compositional nomenclature: Caesium iodate

Additive nomenclature: Caesium trioxidoiodate(1−)

Other names: Cesium iodate
In American English

Formulae and structures

List of formulae

Formula name

Formula

Typical formula: CsIO₃

Compositional formula: CsIO₃

Structural formula

Structural formula with no lone pair

Other structural formulas

Lewis structure

Colored Lewis structure

Properties

List of substance properties

Item

Value

Name: Caesium iodate

Formula: CsIO₃

Appearance: Colorless solid

Odor: Odorless

Molar mass: 307.80 g/mol

Density: 4.934 g/cm³^[1]
Solid, 20°C

Melting point: 565 °C^[1]

Boiling point: –

Constituents

Constituent ions

Ion	Name	Charge number	Number
Cs⁺	Caesium ion	1	1
IO₃⁻	Iodate ion	-1	1

Constituent atoms

Atom	Name	Oxidation state	Number
Cs	Ceasium	+1	1
I	Iodine	+5	1
O	Oxygen	−2	3

Ratio of atoms

Atom	Atomic weight	Number	Atomic ratio	Weight ratio
Cs	132.90545196	1	20.00%	43.18%
I	126.90	1	20.00%	41.23%
O	15.999	3	60.00%	15.59%

Thermodynamic properties

Phase transition properties

Item

Value

Enthalpy of fusion: 13.0 kJ · mol⁻¹^[1]
at 565°C

Enthalpy of vaporization: –

Enthalpy of vaporization at 25°C: –

Enthalpy of other transition: –

Standard thermodynamic properties

State	Standard enthalpy of formation Δ_fH° kJ · mol⁻¹	Standard Gibbs energy of formation Δ_fG° kJ · mol⁻¹	Standard molar entropy S° J · K⁻¹ · mol⁻¹	Standard molar heat capacity at constant pressure C_p° J · K⁻¹ · mol⁻¹
Crystalline solid	–	−433.8^[2]	–	–
Ionized aqueous solution	−479.5^[2]	−420.0^[2]	251.5^[2]	–

Solubility

Qualitative solubility

Reactive

Miscible

Very soluble

Soluble: H₂OWater

Slightly soluble

Very slightly soluble

Insoluble

Solubility in water (g/100 g)^[1]

25°C
2.6

Solubility in water (g/100 g)^[3]

24°C
2.6

Solubility curve (g/100 g)

Preparations

Chemical reactions

Electrolytic dissociation

Electrolytic dissociation of caesium iodate yields caesium ion and iodate ion.

Electrolytic dissociation of caesium iodate ◆ Δ_rG 13.8 kJ/mol K 0.38 × 10⁻² pK 2.42: CsIO₃Caesium iodate
⟶
Cs⁺Caesium ion + IO₃⁻Iodate ion

Reaction with reducing species

The reaction of reducing species and caesium iodate yields a variety of products.

Reaction of hydrogen and caesium iodate ◆ Δ_rG −618.2 kJ/mol K 2.01 × 10¹⁰⁸ pK −108.30: 3H₂Hydrogen + CsIO₃Caesium iodate
⟶
CsICaesium iodide + 3H₂OWater

Reaction of sodium and caesium iodate ◆ Δ_rG −1033.2 kJ/mol K 1.02 × 10¹⁸¹ pK −181.01: 6NaSodium + CsIO₃Caesium iodate
⟶
3Na₂OSodium oxide + CsICaesium iodide

Reaction of hydrogen sulfide and caesium iodate ◆ Δ_rG −517.5 kJ/mol K 4.59 × 10⁹⁰ pK −90.66: 3H₂SHydrogen sulfide + CsIO₃Caesium iodate
⟶
3SSulfur + CsICaesium iodide + 3H₂OWater

Reaction of hydrogen sulfide and caesium iodate ◆ Δ_rG −1596.4 kJ/mol K 4.76 × 10²⁷⁹ pK −279.68: 3H₂SHydrogen sulfide + 4CsIO₃Caesium iodate
⟶
3H₂SO₄Sulfuric acid + 4CsICaesium iodide

Reaction of sodium and caesium iodate ◆ Δ_rG −978.6 kJ/mol K 2.78 × 10¹⁷¹ pK −171.44: 7NaSodium + CsIO₃Caesium iodate
⟶
NaISodium iodide + 3Na₂OSodium oxide + CsCaesium

Reaction with oxidizable species

The reaction of oxidizable species and caesium iodate yields a variety of products.

Reaction of copper and caesium iodate ◆ Δ_rG −295.9 kJ/mol K 6.91 × 10⁵¹ pK −51.84: 3CuCopper + CsIO₃Caesium iodate
⟶
3CuOCopper(II) oxide + CsICaesium iodide

Reaction of copper and caesium iodate ◆ Δ_rG −344.8 kJ/mol K 2.55 × 10⁶⁰ pK −60.41: 6CuCopper + CsIO₃Caesium iodate
⟶
3Cu₂OCopper(I) oxide + CsICaesium iodide

Reaction of iron(II) oxide and caesium iodate: 9FeOIron(II) oxide + CsIO₃Caesium iodate
⟶
3Fe₃O₄Iron(II,III) oxide + CsICaesium iodide

Reaction of iron(II) oxide and caesium iodate: 6FeOIron(II) oxide + CsIO₃Caesium iodate
⟶
3Fe₂O₃Iron(III) oxide + CsICaesium iodide

Reaction of potassium iodide and caesium iodate ◆ Δ_rG 2197.9 kJ/mol K 0.88 × 10⁻³⁸⁵ pK 385.06: 10KIPotassium iodide + 2CsIO₃Caesium iodate
🔥
⟶
5K₂OPotassium oxide + 6I₂Iodine + Cs₂OCaesium oxide

Reaction with oxidizable species under acidic condition

The reaction of oxidizable species, caesium iodate, and hydrogen ion yields a variety of products.

Reaction of copper and caesium iodate under acidic condition ◆ Δ_rG −438.5 kJ/mol K 6.64 × 10⁷⁶ pK −76.82: 3CuCopper + CsIO₃Caesium iodate + 6H⁺Hydrogen ion
⟶
3Cu²⁺Copper(II) ion + CsICaesium iodide + 3H₂OWater

Reaction of potassium iodide and caesium iodate under acidic condition ◆ Δ_rG −276.3 kJ/mol K 2.54 × 10⁴⁸ pK −48.41: 5KIPotassium iodide + CsIO₃Caesium iodate + 6H⁺Hydrogen ion
⟶
5K⁺Potassium ion + 3I₂Iodine + Cs⁺Caesium ion + 3H₂OWater

Reaction of copper and caesium iodate under acidic condition ◆ Δ_rG −823.0 kJ/mol K 1.53 × 10¹⁴⁴ pK −144.18: 5CuCopper + 2CsIO₃Caesium iodate + 12H⁺Hydrogen ion
⟶
5Cu²⁺Copper(II) ion + I₂Iodine + 2Cs⁺Caesium ion + 6H₂OWater

Reaction of potassium iodide and caesium iodate under acidic condition ◆ Δ_rG −276.3 kJ/mol K 2.54 × 10⁴⁸ pK −48.41: 6KIPotassium iodide + CsIO₃Caesium iodate + 6H⁺Hydrogen ion
⟶
6K⁺Potassium ion + 3I₂Iodine + CsICaesium iodide + 3H₂OWater

Reaction with oxidizable species under neutral condition

The reaction of oxidizable species, caesium iodate, and water yields a variety of products.

Reaction of copper and caesium iodate under neutral condition ◆ Δ_rG −453.5 kJ/mol K 2.82 × 10⁷⁹ pK −79.45: 5CuCopper + 2CsIO₃Caesium iodate + H₂OWater
⟶
5CuOCopper(II) oxide + I₂Iodine + 2CsOHCaesium hydroxide

Reaction of copper and caesium iodate under neutral condition ◆ Δ_rG −535.0 kJ/mol K 5.34 × 10⁹³ pK −93.73: 10CuCopper + 2CsIO₃Caesium iodate + H₂OWater
⟶
5Cu₂OCopper(I) oxide + I₂Iodine + 2CsOHCaesium hydroxide

Reaction of potassium iodide and caesium iodate under neutral condition ◆ Δ_rG 203.3 kJ/mol K 0.24 × 10⁻³⁵ pK 35.62: 5KIPotassium iodide + 6CsIO₃Caesium iodate + 3H₂OWater
🔥
⟶
5KIO₃Potassium iodate + 3I₂Iodine + 6CsOHCaesium hydroxide

Reaction of potassium iodide and caesium iodate under neutral condition ◆ Δ_rG 479.5 kJ/mol K 0.99 × 10⁻⁸⁴ pK 84.00: 6KIPotassium iodide + CsIO₃Caesium iodate + 3H₂OWater
🔥
⟶
6KOHPotassium hydroxide + 3I₂Iodine + CsICaesium iodide

Reaction of iron(II) oxide and caesium iodate under neutral condition: 6FeOIron(II) oxide + CsIO₃Caesium iodate + 9H₂OWater
⟶
6Fe(OH)₃Iron(III) hydroxide + CsICaesium iodide

Reaction with hardly oxidizable species

The reaction of hardly oxidizable species and caesium iodate yields a variety of products.

Reaction of hydrogen chloride and caesium iodate ◆ Δ_rG −46.4 kJ/mol K 1.35 × 10⁸ pK −8.13: 6HClHydrogen chloride + CsIO₃Caesium iodate
🔥
⟶
3Cl₂Chlorine + CsICaesium iodide + 3H₂OWater

Reaction of hydrogen chloride and caesium iodate ◆ Δ_rG −240.6 kJ/mol K 1.42 × 10⁴² pK −42.15: 12HClHydrogen chloride + 2CsIO₃Caesium iodate
⟶
5Cl₂Chlorine + I₂Iodine + 2CsClCaesium chloride + 6H₂OWater

Reaction of gold and caesium iodate: 2AuGold + CsIO₃Caesium iodate
🔥
⟶
Au₂O₃Gold(III) oxide + CsICaesium iodide

Reaction of sodium chloride and caesium iodate ◆ Δ_rG 760.7 kJ/mol K 0.54 × 10⁻¹³³ pK 133.27: 3NaClSodium chloride + 4CsIO₃Caesium iodate
🔥
⟶
3NaClO₄Sodium perchlorate + 4CsICaesium iodide

Reaction of sodium chloride and caesium iodate ◆ Δ_rG 224.0 kJ/mol K 0.57 × 10⁻³⁹ pK 39.24: NaClSodium chloride + CsIO₃Caesium iodate
🔥
⟶
NaISodium iodide + CsClO₃Caesium chlorate

Reaction with hardly oxidizable species under acidic condition

The reaction of hardly oxidizable species, caesium iodate, and hydrogen ion yields a variety of products.

Reaction of gold and caesium iodate under acidic condition: 2AuGold + CsIO₃Caesium iodate + 6H⁺Hydrogen ion
🔥
⟶
2Au³⁺Gold(III) ion + CsICaesium iodide + 3H₂OWater

Reaction of hydrogen chloride and caesium iodate under acidic condition ◆ Δ_rG 161.9 kJ/mol K 0.43 × 10⁻²⁸ pK 28.36: 10HClHydrogen chloride + 2CsIO₃Caesium iodate + 2H⁺Hydrogen ion
🔥
⟶
5Cl₂Chlorine + I₂Iodine + 2Cs⁺Caesium ion + 6H₂OWater

Reaction of gold and caesium iodate under acidic condition: 10AuGold + 6CsIO₃Caesium iodate + 36H⁺Hydrogen ion
🔥
⟶
10Au³⁺Gold(III) ion + 3I₂Iodine + 6Cs⁺Caesium ion + 18H₂OWater

Reaction of sodium chloride and caesium iodate under acidic condition ◆ Δ_rG 152.4 kJ/mol K 0.20 × 10⁻²⁶ pK 26.70: 6NaClSodium chloride + CsIO₃Caesium iodate + 6H⁺Hydrogen ion
🔥
⟶
6Na⁺Sodium ion + 3Cl₂↑Chlorine + CsICaesium iodide + 3H₂OWater

Reaction of hydrogen chloride and caesium iodate under acidic condition ◆ Δ_rG 205.7 kJ/mol K 0.92 × 10⁻³⁶ pK 36.04: 6HClHydrogen chloride + CsIO₃Caesium iodate + H⁺Hydrogen ion
🔥
⟶
3Cl₂Chlorine + HIHydrogen iodide + Cs⁺Caesium ion + 3H₂OWater

Reaction with hardly oxidizable species under neutral condition

The reaction of hardly oxidizable species, caesium iodate, and water yields a variety of products.

Reaction of gold and caesium iodate under neutral condition ◆ Δ_rG 170.8 kJ/mol K 0.12 × 10⁻²⁹ pK 29.92: 2AuGold + CsIO₃Caesium iodate + 3H₂OWater
🔥
⟶
2Au(OH)₃Gold(III) hydroxide + CsICaesium iodide

Reaction of gold and caesium iodate under neutral condition ◆ Δ_rG 1308.3 kJ/mol K 0.62 × 10⁻²²⁹ pK 229.20: 10AuGold + 6CsIO₃Caesium iodate + 18H₂OWater
🔥
⟶
10Au(OH)₃Gold(III) hydroxide + 3I₂Iodine + 6CsOHCaesium hydroxide

Reaction of sodium chloride and caesium iodate under neutral condition ◆ Δ_rG 631.7 kJ/mol K 0.21 × 10⁻¹¹⁰ pK 110.67: 6NaClSodium chloride + 7CsIO₃Caesium iodate + 3H₂OWater
🔥
⟶
6NaIO₃Sodium iodate + 3Cl₂↑Chlorine + CsICaesium iodide + 6CsOHCaesium hydroxide

Reaction of sodium chloride and caesium iodate under neutral condition ◆ Δ_rG 1120.5 kJ/mol K 0.50 × 10⁻¹⁹⁶ pK 196.30: 10NaClSodium chloride + 12CsIO₃Caesium iodate + 6H₂OWater
🔥
⟶
10NaIO₃Sodium iodate + 5Cl₂↑Chlorine + I₂Iodine + 12CsOHCaesium hydroxide

Electrolysis of aqueous solution

Electrolysis of aqueous caesium iodate yields a variety of products.

Electrolysis of aqueous caesium iodate with water as non-redox agent ◆ Δ_rG 390.1 kJ/mol K 0.45 × 10⁻⁶⁸ pK 68.34: 4CsIO₃Caesium iodate + 2H₂OWater
💧⚡
⟶
4CsOHCaesium hydroxide + 2I₂Iodine + 5O₂↑Oxygen

Electrolysis of water ◆ Δ_rG 474.258 kJ/mol K 0.82 × 10⁻⁸³ pK 83.09: 2H₂OWater
⚡
⟶
2H₂↑Hydrogen + O₂↑Oxygen

Electrolysis of aqueous caesium iodate without water as reactant ◆ Δ_rG 186.4 kJ/mol K 0.22 × 10⁻³² pK 32.66: 2CsIO₃Caesium iodate
💧⚡
⟶
2CsICaesium iodide + 3O₂↑Oxygen

Electrolysis of aqueous caesium iodate with water as reducing agent ◆ Δ_rG 710.5 kJ/mol K 0.34 × 10⁻¹²⁴ pK 124.47: 2CsIO₃Caesium iodate + 6H₂OWater
💧⚡
⟶
2CsOHCaesium hydroxide + I₂Iodine + 5H₂O₂Hydrogen peroxide

Electrolysis of aqueous caesium iodate with water as non-redox agent ◆ Δ_rG 1401.1 kJ/mol K 0.35 × 10⁻²⁴⁵ pK 245.46: 6CsIO₃Caesium iodate + 3H₂OWater
💧⚡
⟶
6CsOHCaesium hydroxide + 3I₂Iodine + 5O₃↑Ozone

Molten salt electrolysis

Molten salt electrolysis of caesium iodate yields a variety of products.

Molten salt electrolysis of caesium iodate ◆ Δ_rG 186.4 kJ/mol K 0.22 × 10⁻³² pK 32.66: 2CsIO₃Caesium iodate
🔥⚡
⟶
2CsICaesium iodide + 3O₂↑Oxygen

Molten salt electrolysis of caesium iodate ◆ Δ_rG 867.6 kJ/mol K 0.10 × 10⁻¹⁵¹ pK 152.00: 2CsIO₃Caesium iodate
🔥⚡
⟶
2CsCaesium + I₂Iodine + 3O₂↑Oxygen

Decomposition

Decomposition of caesium iodate yields a variety of products.

Decomposition of caesium iodate ◆ Δ_rG 186.4 kJ/mol K 0.22 × 10⁻³² pK 32.66: 2CsIO₃Caesium iodate
🔥
⟶
2CsICaesium iodide + 3O₂↑Oxygen

Decomposition of caesium iodate ◆ Δ_rG 1118.9 kJ/mol K 0.95 × 10⁻¹⁹⁶ pK 196.02: 4CsIO₃Caesium iodate
🔥
⟶
2Cs₂OCaesium oxide + 2I₂Iodine + 5O₂↑Oxygen

References

List of references

1
James G. Speight (2017)
Lange's Handbook of Chemistry, 17th edition
https://www.accessengineeringlibrary.com/content/book/9781259586095
McGraw Hill Education
- Amazon
Citation list
- ^ Density, 4.934 g/cm³ - p.39
- ^ Melting point, 565 °C - p.39
- ^ Enthalpy of fusion, 13.0 kJ · mol⁻¹ - p.299
- ^ Solubility in Water (g/100 g), See the table - p.39
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
https://doi.org/10.18434/M32124
National Institute of Standards and Technology (NIST)
Citation list
3
Atherton Seidell (1919)
Solubilities of Inorganic and Organic Compounds: A Compilation of Quantitative Solubility Data From the Periodical Literature
D. Van Nostrand Company
- Amazon
Citation list
- ^ Solubility in Water (g/100 g), See the table - p.183

Δ_rG	−75.3 kJ/mol
K	1.56 × 10¹³
pK	−13.19

Δ_rG	−503.8 kJ/mol
K	1.83 × 10⁸⁸
pK	−88.26

Δ_rG	10.2 kJ/mol
K	0.16 × 10⁻¹
pK	1.79

Δ_rG	−110.1 kJ/mol
K	1.94 × 10¹⁹
pK	−19.29

Caesium iodate

Names

List of substance names

Formulae and structures

List of formulae

Properties

List of substance properties

Constituents

Constituent ions

Constituent atoms

Ratio of atoms

Thermodynamic properties

Phase transition properties

Standard thermodynamic properties

Solubility

Qualitative solubility

Solubility in water (g/100 g)[1]

Solubility in water (g/100 g)[3]

Solubility curve (g/100 g)

Preparations

Reaction of acid and base

Reaction of basic oxide and acid

Reaction of salt of weak acid and strong acid

Reaction of active metal and acid

Chemical reactions

Electrolytic dissociation

Reaction with reducing species

Reaction with oxidizable species

Reaction with oxidizable species under acidic condition

Reaction with oxidizable species under neutral condition

Reaction with hardly oxidizable species

Reaction with hardly oxidizable species under acidic condition

Reaction with hardly oxidizable species under neutral condition

Electrolysis of aqueous solution

Molten salt electrolysis

Decomposition

References

List of references

Related substances

Iodate of alkali metal

Acid

Base and basic oxide

Related categories

Classification by constituent

Type of substance

State of substance

Property of substance

Solubility of substance

Color of substance

Odor of substance

Solubility in water (g/100 g)^[1]

Solubility in water (g/100 g)^[3]