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7KI + 3Na2SeO4 🔥→ KIO3 + 3K2SeO3 + 6NaI

The reaction of potassium iodide and sodium selenate yields potassium iodate, potassium selenite, and sodium iodide (Other reactions are here). This reaction is an oxidation-reduction reaction and is classified as follows:

Table of contents
  1. 1Reaction data
  2. 2Thermodynamic changes
  3. 3References
  4. 4Related reactions
  5. 5Related categories

Reaction data

Chemical equation

General equation

Reaction of oxidizable species and reducible species
Oxidizable speciesReducing agent + Reducible speciesOxidizing agent
🔥
ProductOxidation product + ProductReduction product

Oxidation state of each atom

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
KIPotassium iodide7
Reducing
Oxidizable
Na2SeO4Sodium selenate3
Oxidizing
Reducible

Products

Chemical formulaNameCoefficientTypeType in general
equation
KIO3Potassium iodate1
Oxidized
K2SeO3Potassium selenite3
Reduced
NaISodium iodide6

Thermodynamic changes

Changes in standard condition

Reaction of potassium iodide and sodium selenate
7KICrystalline solid + 3Na2SeO4Crystalline solid
🔥
KIO3Crystalline solid + 3K2SeO3Crystalline solid + 6NaICrystalline solid
Standard enthalpy
of reaction
ΔrH°
kJ · mol−1
Standard
Gibbs energy
of reaction
ΔrG°
kJ · mol−1
Standard entropy
of reaction
ΔrS°
J · K−1 · mol−1
Standard heat
capacity of reaction
at constant pressure
ΔrCp°
J · K−1 · mol−1
per 1 mol of
Equation
328.3
per 1 mol of
46.90
per 1 mol of
109.4
per 1 mol of
328.3
per 1 mol of
109.4
per 1 mol of
54.72

Changes in aqueous solution

Reaction of potassium iodide and sodium selenate
ΔrG138.6 kJ/mol
K0.52 × 10−24
pK24.28
7KIIonized aqueous solution + 3Na2SeO4Ionized aqueous solution
🔥
KIO3Ionized aqueous solution + 3K2SeO3Ionized aqueous solution + 6NaIIonized aqueous solution
Standard enthalpy
of reaction
ΔrH°
kJ · mol−1
Standard
Gibbs energy
of reaction
ΔrG°
kJ · mol−1
Standard entropy
of reaction
ΔrS°
J · K−1 · mol−1
Standard heat
capacity of reaction
at constant pressure
ΔrCp°
J · K−1 · mol−1
per 1 mol of
Equation
104.6138.6−115.9
per 1 mol of
14.9419.80−16.56
per 1 mol of
34.8746.20−38.63
per 1 mol of
104.6138.6−115.9
per 1 mol of
34.8746.20−38.63
per 1 mol of
17.4323.10−19.32

Thermodynamic data of reactants

Chemical formulaStandard 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
KI (cr)-327.900[1]-324.892[1]106.32[1]52.93[1]
KI (g)-125.5[1]-166.1[1]258.3[1]37.11[1]
KI (ai)-307.57[1]-334.85[1]213.8[1]-120.5[1]
Na2SeO4 (cr)-1069.0[1]
Na2SeO4 (ai)-1079.5[1]-965.2[1]172.0[1]
Na2SeO4 (cr)
10 hydrate
-4006.6[1]
* (cr):Crystalline solid, (g):Gas, (ai):Ionized aqueous solution

Thermodynamic data of products

Chemical formulaStandard 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
KIO3 (cr)-501.37[1]-418.35[1]151.46[1]106.48[1]
KIO3 (ai)-473.6[1]-411.2[1]220.9[1]
K2SeO3 (cr)-982.0[1]
K2SeO3 (ai)-1013.8[1]-936.3[1]218.0[1]
NaI (cr)-287.78[1]-286.06[1]98.53[1]52.09[1]
NaI (g)-79.5[1]-121.0[1]248.978[1]36.65[1]
NaI (ai)-295.31[1]-313.47[1]170.3[1]-95.8[1]
NaI (cr)
1 hydrate
-883.096[1]-771.10[1]196.2[1]
* (cr):Crystalline solid, (ai):Ionized aqueous solution, (g):Gas

References

List of references

  1. 1
    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)