Measuring WS₂’s solubility involves assessing its dissolution in solvents, though its extreme insolubility (<10⁻⁶ g/L in water, acids, etc.) makes this challenging. Standard methods include gravimetric analysis, spectrometry, and chemical detection of reaction products. For water or alcohols, WS₂ powder is immersed (e.g., 1 g in 100 mL, 25°C) for days, then filtered. The filtrate’s mass (dried) or dissolved ions (via ICP-MS) are analyzed, typically showing no detectable loss (<0.0001 g), confirming insolubility.
In dilute HCl, similar steps apply, with pH monitoring or H₂S detection (if any) added—results show no change. For aqua regia or molten NaOH, solubility isn’t measured directly; instead, reaction products are quantified. In aqua regia, WO₃ precipitate is weighed, and H₂S is trapped (e.g., with Pb²⁺ solution), indicating decomposition extent. In molten NaOH, post-reaction solutions are diluted, and WO₄²⁻/S²⁻ are titrated or spectroscopically analyzed (e.g., UV-Vis at 260 nm for tungstate).
Precision requires controlling variables (temperature, particle size, time) and using sensitive instruments (e.g., ICP-MS detects <1 ppb). WS₂’s insolubility aligns with TMDs, guiding its use where chemical stability is key. These methods differentiate true solubility from reactivity, critical for material assessment.
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