What Units are Used for Hansen Solubility Parameter?

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SUMMARY

The Hansen Solubility Parameter (HSP) utilizes units of mPa0.5 to quantify hydrogen bonding interactions, rather than kJ/mol-1. This choice reflects the need to express solubility factors in terms of square root of pressure, allowing for the addition of these factors in quadrature. Hansen identified three key factors influencing solubility predictions, emphasizing that while activities and fugacities of solutes and solvents can be expressed in pressure units, they are not direct measurements of energy but are proportional to interaction energies.

PREREQUISITES
  • Understanding of Hansen Solubility Parameters
  • Familiarity with units of pressure and their mathematical implications
  • Knowledge of solubility concepts in chemistry
  • Basic grasp of molecular interactions and hydrogen bonding
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  • Research the mathematical formulation of Hansen Solubility Parameters
  • Explore the significance of fugacity in solution chemistry
  • Learn about the quadrature method in solubility predictions
  • Investigate the relationship between pressure units and molecular interaction energies
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Chemists, materials scientists, and researchers involved in solubility studies and molecular interaction analysis will benefit from this discussion.

Pen Rie
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For those of you who know what a Hansen Solubility Parameter is, does the "hydrogen-bonding" part means the actual hydrogen bond energy between molecules? I'm confused as to why they used mPa^0.5 instead of kJ/mol^-1 for measurement.
 
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"MPa0.5?" Or, "sqrt(MPa)?" Hansen identified three factors to consider for predictions of solubilities. He assigned units of square root of pressure to them to add them in quadrature. Activities/fugacities of solutes and solvents that do not dissociate when mixed to form a solution can be expressed in units of pressure, or as ratios of pressures. Actual energies? No. Proportional to energies of the interactions? Yes.
 

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