As the material for white powder, tantalum, the tantalum carbide, general ceramics, piezoelectric ceramics and ceramic capacitor 1. Molecular Formula: Ta2O5 2. Molecular Weight: 441.8 3. Appearance: powder shape, white or light yellow 4. Tantalum oxide, white three party crystals or powder, density 8.2 g/cm3. Mp 1785 °C. Insoluble in water, soluble in ethanol, acid, hydrofluoric acid. Both sexes ...