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Colloidal dispersions of tungstic acid (H₂WO₄) have been prepared in water/(TX-100+alkanol)/n-heptane water-in-oil microemulsion media by reacting Na₂WO₄ with HCl. The effects of alkanol chain length, TX-100/alkanol mass ratio, temperature, and dilution at different [water]/[TX-100] mole ratios (ω) have been studied by the dynamic light scattering technique. The formation of H₂WO₄ in the microwater pool has been established by FT-IR measurements. The particle sizes and shapes in microemulsion media and in isolated states have been measured by TEM and SEM techniques. The enthalpy of formation of H₂WO₄ in the water pool of the microemulsions has also been determined microcalorimetrically.