Acids and bases
Hydrochloric acid vs sulfuric acid
Hydrochloric acid (HCl, CAS 7647-01-0) and sulfuric acid (H2O4S, CAS 7664-93-9) are both listed under inorganic acids.
Hydrochloric acid has a molar mass of 36.46 g/mol, sulfuric acid 98.08 g/mol.
Measured boiling points are -85 °C for hydrochloric acid and 337 °C for sulfuric acid.
Both carry the GHS signal word Danger.
Data last updated 7 October 2026
 |  | |
|---|---|---|
| Identity | ||
| Name in our database | Hydrochloric acid | Sulfuric acid |
| CAS number | 7647-01-0 | 7664-93-9 |
| Molecular formula | HCl | H2O4S |
| Molar mass | 36.46 g/mol | 98.08 g/mol |
| IUPAC name | chlorane | sulfuric acid |
| EC number | 231-595-7 | 231-639-5 |
| Physical properties | ||
| Appearance | Colorless gas | Colorless, oily liquid |
| Melting point | -114.2 °C | 10.3 °C |
| Boiling point | -85 °C | 337 °C |
| Density | 1.639 g/L | 1.8302 g/cm³ |
| Solubility | Solubility in water, 82.3 g/100 g water at 0 °C, 67.3 g/100 g water at 30 °C, 63.3 g/100 g water at 40 °C, 59.6 g/100 g water at 50 °C, 56.1 g/100 g water at 60 °C | Miscible with water and alcohol with the generation of much heat and with contraction in volume. |
| LogP (octanol/water)Computed from the structure | 0.42 | -0.65 |
| Safety (GHS) | ||
| Signal word | Danger | Danger |
| Pictograms | ||
| Hazard statements |
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| UN number | UN 1789 | UN 1831 |
| Uses and classification | ||
| Uses and functions |
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| Category | Inorganic chemicals › Inorganic acids | Inorganic chemicals › Inorganic acids |
| HS code | 280610Hydrogen chloride (hydrochloric acid) | 280700Sulphuric acid, oleum |
| Market on CompoundList | ||
| Suppliers | Trading restricted on CompoundList | Trading restricted on CompoundList |
Measured and computed values as shown on each chemical page, plus live listings on CompoundList. Details may have changed, please confirm them with the supplier. Safety data is a summary, not an SDS.
Hydrochloric acid
Sulfuric acid
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