Data on primary hydration characteristics of aqueous electrolytes

Area of Science:

• Physical Chemistry
• Solution Chemistry

Background:

• Electrolyte solutions exhibit complex behavior influenced by solute-solvent interactions.
• Understanding osmotic coefficients is crucial for predicting solution properties.

Purpose of the Study:

• To present graphical data supporting the decoupling of electrolyte osmotic coefficients.
• To demonstrate the presence of linear regions in osmotic coefficient plots across various electrolytes.
• To provide a method for estimating hydration parameters from these linear regions.

Main Methods:

• Plotting osmotic coefficients against molality for over 100 aqueous single electrolytes at 25°C.
• Identifying and marking linear regions within these plots.
• Calculating primary molar hydration volume and hydration number from the slopes of linear regions.

Main Results:

• Linear regions were observed in osmotic coefficient plots for all studied electrolytes, extending over a wide concentration range.
• Primary molar hydration volume and hydration number were estimated for numerous electrolytes.
• The data reinforce previous findings on electrolyte behavior and provide a basis for estimating nonelectrostatic contributions.

Conclusions:

• The consistent linearity in osmotic coefficient plots offers a robust method for hydration parameter estimation.
• The presented data support the rationale for separating electrostatic and nonelectrostatic contributions to osmotic coefficients.
• This work provides valuable data for further research in electrolyte solution theory.