Calcium, doubly charged positive ion

• Formula: Ca⁺²
• Molecular weight: 40.077
• CAS Registry Number: 14127-61-8
• Information on this page:
  • Ion clustering data
  • References
  • Notes
• Other data available:
  • Reaction thermochemistry data
• Options:
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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: Michael M. Meot-Ner (Mautner) and Sharon G. Lias

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Clustering reactions

(Ca⁺² • 4 • ) +  = (Ca⁺² • 5 • )

By formula: (Ca⁺² • 4CO₂ • CCaO₃) + CO₂ = (Ca⁺² • 5CO₂ • CCaO₃)

Free energy of reaction

(Ca⁺² • 5) +  = (Ca⁺² • 6)

By formula: (Ca⁺² • 5CO₂) + CO₂ = (Ca⁺² • 6CO₂)

Free energy of reaction

(Ca⁺² • 8) +  = (Ca⁺² • 9)

By formula: (Ca⁺² • 8H₂O) + H₂O = (Ca⁺² • 9H₂O)

Free energy of reaction

(Ca⁺² • 9) +  = (Ca⁺² • 10)

By formula: (Ca⁺² • 9H₂O) + H₂O = (Ca⁺² • 10H₂O)

Free energy of reaction

(Ca⁺² • 10) +  = (Ca⁺² • 11)

By formula: (Ca⁺² • 10H₂O) + H₂O = (Ca⁺² • 11H₂O)

Free energy of reaction

(Ca⁺² • 11) +  = (Ca⁺² • 12)

By formula: (Ca⁺² • 11H₂O) + H₂O = (Ca⁺² • 12H₂O)

Free energy of reaction

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.

Spears and Fehsenfeld, 1972
Spears, K.G.; Fehsenfeld, F.C., Termolecular Association Reactions of Mg, Ca, and Ba Ions, J. Chem. Phys., 1972, 56, 11, 5698, https://doi.org/10.1063/1.1677091 . [all data]

Blades, Jayaweera, et al., 1990
Blades, A.T.; Jayaweera, P.; Ikonomou, M.G.; Kebarle, P., Studies of Alkaline - Earth and Transition - Metal M++ Gas - Phase Ion Chemistry, J. Chem. Phys., 1990, 92, 10, 5900, https://doi.org/10.1063/1.458360 . [all data]

Notes

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• Symbols used in this document:
  

  T	Temperature
  ΔrG°	Free energy of reaction at standard conditions
  ΔrH°	Enthalpy of reaction at standard conditions
  ΔrS°	Entropy of reaction at standard conditions

• Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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