Water
Properties
- Molecular formula
- H2O
- Molar mass
- 18.02 g/mol
- Exact mass
- 18.0106 Da
- Density
- 1.0029 g/mL (at 25 °C)
- Melting point
- 0 °C
- Boiling point
- 100 °C
- logP
- -0.82Crippen estimate
- Polar surface area
- 31.5 Ų
- H-bond donors / acceptors
- 0 / 0
- Rotatable bonds
- 0
Hazards
Not classified as hazardous under GHS by 1,876 ECHA notifiers. Aggregated from 1,876 ECHA notifications, via PubChem; a share says how many notifiers assign that statement.
Identifiers
CAS number
7732-18-5SMILES
OInChIKey
XLYOFNOQVPJJNP-UHFFFAOYSA-NInChI
InChI=1S/H2O/h1H2Weigh it out
Type any one amount. The others follow from the molar mass and density.
Names and synonyms
7 names
- R 718
- Hydrogen oxide (H2O)
- Distilled water
- NSC 147337
- Aquafina
- Ultrex II ultrapure
- Milli-Q water
Reactions
Safety data sheets
9 stored sheets list this compound in section 3, matched by the CAS number 7732-18-5. Each row opens the sheet with its composition and PDF.
- 3-Chloroperoxybenzoic acid, 70-75% > 17 %Fisher Scientific UK · 2024-02-09
- Dimethylamine, solution in water 55–74 %Fisher Scientific Company · 2025-12-19
- Hydrochloric Acid 62–65 %Fisher Scientific Company · 2025-12-18
- Hydrogen peroxide, 30% 65–80 %Fisher Scientific Company · 2025-12-18
- Nitric acid (65 - 70%) 30–35 %Fisher Scientific Company · 2025-12-18
- Orthophosphoric acid 15 %Fisher Scientific UK · 2023-10-20
- Sulfuric Acid (Certified ACS Plus) 2–10 %Fisher Scientific Company · 2025-12-18
- Tetrabutylammonium fluoride, 1M solution in THF < 8 %Fisher Scientific UK · 2024-12-06
- Trimethylamine, 45-50 wt.% aqueous solution 50–55 %Fisher Scientific Company · 2025-12-19
Work with Water
Predict the NMR spectrum1H and 13C shifts with multiplicities
Make a solutionWhat to weigh for any molarity and volume
Check drug-likenessLipinski, Veber and lead-likeness
Boiling point under vacuumAt any pressure, from its normal boiling point
Isotope patternExact mass and the mass spectrum pattern
Stereoisomers, salts and isotopologues
The same compound in another form: other stereochemistry, a salt or hydrate, the free acid or base, or an isotope-labelled version.
Similar compounds
Hydrazine, hydrate10217-52-450 % similar
Terbium oxide (Tb4O7)12037-01-350 % similar
Hydrazine hydrate (1:1)7803-57-850 % similar
Lithium chloride monohydrate16712-20-238 % similar
Lithium chloride hydrate85144-11-238 % similar
Tin dichloride dihydrate10025-69-133 % similar
Strontium dichloride hexahydrate10025-70-433 % similar
Erbium trichloride hexahydrate10025-75-933 % similar
Tanimoto similarity of circular fingerprints over the whole catalogue. All similar compounds