Hydroxide ion

Hydroxide ion: formula OH^-, charge −, atomic composition and molar mass.

IonOH⁻

OH⁻

Charge−

Molar mass17.007 g/mol

Atoms2

H · Hydrogen1 × H O · Oxygen1 × O

This ion has a net charge of −. Its formula directly shows the number of atoms of each element.

The displayed molar mass uses the atomic weights of the elements. For ordinary chemical calculations, the mass of electrons gained or lost is negligible at this precision.