potassium iodide


Gas phase thermochemistry data

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Quantity Value Units Method Reference Comment
Δfgas-30.000kcal/molReviewChase, 1998Data last reviewed in June, 1967
Quantity Value Units Method Reference Comment
gas,1 bar61.730cal/mol*KReviewChase, 1998Data last reviewed in June, 1967

Gas Phase Heat Capacity (Shomate Equation)

Cp° = A + B*t + C*t2 + D*t3 + E/t2
H° − H°298.15= A*t + B*t2/2 + C*t3/3 + D*t4/4 − E/t + F − H
S° = A*ln(t) + B*t + C*t2/2 + D*t3/3 − E/(2*t2) + G
    Cp = heat capacity (cal/mol*K)
    H° = standard enthalpy (kcal/mol)
    S° = standard entropy (cal/mol*K)
    t = temperature (K) / 1000.

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Temperature (K) 2500. to 6000.
A 8.940302
B 0.198002
C -0.000485
D 0.000042
E -0.011316
F -32.71231
G 72.42770
H -30.00000
ReferenceChase, 1998
Comment Data last reviewed in June, 1967

Condensed phase thermochemistry data

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Quantity Value Units Method Reference Comment
Δfliquid-74.773kcal/molReviewChase, 1998Data last reviewed in June, 1967
Quantity Value Units Method Reference Comment
liquid,1 bar27.271cal/mol*KReviewChase, 1998Data last reviewed in June, 1967
Quantity Value Units Method Reference Comment
Δfsolid-78.370kcal/molReviewChase, 1998Data last reviewed in June, 1967
Quantity Value Units Method Reference Comment
solid25.423cal/mol*KReviewChase, 1998Data last reviewed in June, 1967

Liquid Phase Heat Capacity (Shomate Equation)

Cp° = A + B*t + C*t2 + D*t3 + E/t2
H° − H°298.15= A*t + B*t2/2 + C*t3/3 + D*t4/4 − E/t + F − H
S° = A*ln(t) + B*t + C*t2/2 + D*t3/3 − E/(2*t2) + G
    Cp = heat capacity (cal/mol*K)
    H° = standard enthalpy (kcal/mol)
    S° = standard entropy (cal/mol*K)
    t = temperature (K) / 1000.

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Temperature (K) 954. to 2500.
A 17.30000
B -3.890280×10-10
C 2.440010×10-10
D -4.843060×10-11
E -9.848151×10-12
F -79.93000
G 48.20590
H -74.77211
ReferenceChase, 1998
Comment Data last reviewed in June, 1967

Solid Phase Heat Capacity (Shomate Equation)

Cp° = A + B*t + C*t2 + D*t3 + E/t2
H° − H°298.15= A*t + B*t2/2 + C*t3/3 + D*t4/4 − E/t + F − H
S° = A*ln(t) + B*t + C*t2/2 + D*t3/3 − E/(2*t2) + G
    Cp = heat capacity (cal/mol*K)
    H° = standard enthalpy (kcal/mol)
    S° = standard entropy (cal/mol*K)
    t = temperature (K) / 1000.

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Temperature (K) 298. to 954.
A 17.59650
B -20.41980
C 31.09400
D -11.67930
E -0.120080
F -83.36489
G 50.85120
H -78.37010
ReferenceChase, 1998
Comment Data last reviewed in June, 1967

Phase change data

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Antoine Equation Parameters

log10(P) = A − (B / (T + C))
    P = vapor pressure (atm)
    T = temperature (K)

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Temperature (K) A B C Reference Comment
1018. to 1597.4.396506421.797-136.338Stull, 1947Coefficents calculated by NIST from author's data.

Ion clustering data

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled by: John E. Bartmess

Note: Please consider using the reaction search for this species. This page allows searching of all reactions involving this species. Searches may be limited to ion clustering reactions. A general reaction search form is also available.

Clustering reactions

Iodide + potassium iodide = (Iodide • potassium iodide)

By formula: I- + IK = (I- • IK)

Quantity Value Units Method Reference Comment
Δr38.9 ± 2.1kcal/molN/ABurdukovskaya, Kudin, et al., 1984gas phase; value altered from reference due to conversion from electron convention to ion convention

References

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Chase, 1998
Chase, M.W., Jr., NIST-JANAF Themochemical Tables, Fourth Edition, J. Phys. Chem. Ref. Data, Monograph 9, 1998, 1-1951. [all data]

Stull, 1947
Stull, Daniel R., Vapor Pressure of Pure Substances. Organic and Inorganic Compounds, Ind. Eng. Chem., 1947, 39, 4, 517-540, https://doi.org/10.1021/ie50448a022 . [all data]

Burdukovskaya, Kudin, et al., 1984
Burdukovskaya, G.G.; Kudin, L.S.; Butman, M.F.; Krasnov, K.S., Ionic forms in the vapour over potassium iodide, Russ. J. Inorg. Chem., 1984, 29, 3020. [all data]


Notes

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