No, WS₂ is not soluble in water. Its solubility is negligible (<10⁻⁶ g/L), due to its covalent W-S bonds and non-polar, hydrophobic nature. Water molecules cannot penetrate the van der Waals-bonded layers or disrupt the lattice, as WS₂ lacks ionic or hydrophilic groups. Tests immersing WS₂ powder in water (e.g., 25°C, pH 7) show no detectable dissolution via spectrometry or mass loss over weeks.
This insolubility contrasts with salts (e.g., NaCl, 360 g/L) but aligns with other TMDs like MoS₂. Temperature (up to 100°C) or pH variations (2-12) have minimal effect, as WS₂ resists hydrolysis or ionization. Prolonged exposure may cause trace surface oxidation in air-saturated water, but this is a slow reaction, not dissolution. Insolubility in water suits WS₂ for underwater bearings or humid environments, ensuring stability without leaching.
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