7757-82-6 | Sodium Sulfate (Na₂SO₄)

Chemical type

• Ionic salt

Key properties

• Provides ionic conductivity
• Used to minimize electrode reactions (compared to NaCl)

• Solubility in water at 20°C: 1.354 mol/L.
• Present in pore solution; contributes to osmotic suction.
• Can crystallize as mirabilite (Na₂SO₄·10H₂O) or thenardite (Na₂SO₄) during phase change, leading to salt expansion.
• At 0.5°C, the solubility is 50.6 g/L.
• Its addition to loess increases pore solution concentration.

• Electrolyte solution in the electrode chambers (EC) of the experimental ED setup.

• Used to prepare saline loess samples to study salt weathering mechanisms in check dams.
• Identified as the primary culprit for salt weathering hazards in field surveys of loess check dams in northern Shaanxi.

Classification by use

• Supporting electrolyte in electrochemical systems

• Chemical used in geotechnical/civil engineering research

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1. [Cite:1] Voltage optimization strategy to reduce electric field non-uniformity and improve efficiency in electrodialysis systems, Electrochemistry Communications, Volume 183, February 2026, 108104
2. [Cite:2] Evaluation of the relationship between freezing point and suction of sodium sulfate loess near 0°C, Soils and Foundations, Volume 66, Issue 2, April 2026, 101753