| Property | Typical Value | | :--- | :--- | | Appearance | Clear to pale yellow liquid | | Odor | Slight acidic or sulfur-like | | pH (100% conc.) | < 2.0 (Strongly acidic) | | Boiling point | ~100°C (212°F) | | Melting point | < 0°C (32°F) | | Specific gravity | 1.15 – 1.25 (heavier than water) | | Solubility in water | Complete and exothermic (heats up) | | Viscosity | Water-thin to slightly oily |