HClHCl36.4600 g·mol⁻¹
Molar mass36.460 g·mol⁻¹calc 36.458 • Atomic weights: CIAAW 2021 (conventional atomic weights)
FormulaHClHCl
Classacid • covalentliquid
| Element | Count | Mass (g/mol) | Mass % |
|---|---|---|---|
| H | 1 | 1.008 | 2.76% |
| Cl | 1 | 35.450 | 97.24% |
Physical properties
- State at STP
- liquid
- Density
- 1.18 g·cm⁻³ (aq. 37% at 20 °C, 1 atm)
- Melting point
- 247 K (1 atm (conc. aq.))
- Boiling point
- 383 K (1 atm (azeotrope ~20%))
Structure & bonding
Hydrogen chloride gas dissolved in water fully ionizes to H+ and Cl-.
Occurrence & preparation
Stomach acid (dilute). Industrial by reaction of NaCl with H2SO4.
Uses
- pH adjustment
- Steel pickling
Safety
Corrosive to skin, eyes, respiratory tract.
Consult current SDS. — consult current SDS before handling.