Strontium Oxide(SrO) Properties(25 Facts You Should Know)

Strontium oxide or SrO is the oxide of Strontium. It is an alkaline-earth metal. Let us discuss some important facts about SrO in this article.

Strontium oxide is also called as Strontia. It is formed when strontium metal reacts with oxygen. It can also be obtained by the decomposition of strontium carbonate. Sr and oxygen undergo d2sp3 hybridization. SrO has three allotropic forms. It is insoluble in acetone and ether.

SrO is similar to calcium and barium in its physical and chemical properties. Let us discuss the basic properties of strontium oxide in this article. We will also discuss  molar mass, viscosity, molar density, reactions of SrO with acids, bases, oxides and metals.

Strontium oxide IUPAC name

The IUPAC name of SrO is strontium oxide.

Strontium oxide chemical formula

The chemical formula of Strontium oxide is SrO as strontium and oxygen are present in 1:1 proportion.

strontium oxide properties
Strontium Oxide

Strontium oxide CAS number

The CAS number of Strontium oxide is 1314-11-0.

Strontium oxide ChemSpider ID

The ChemSpider ID of Strontium oxide is 66603.

Strontium oxide chemical classification

The classification of Strontium Oxide is as follows –

  • Strontium Oxide belongs to group II.
  • Strontium Oxide is an alkaline earth metal.
  • Strontium Oxide exists usually in powder form.
  • Strontium Oxide is a strong basic oxide.

Strontium oxide molar mass

The molar mass of Strontium oxide is 103.619 g/mol. The molar mass of strontium is 87.62 g/mol and oxygen atom is 16.00 g/mol.

Strontium oxide color

Strontium oxide looks is grayish-white in color.

Strontium oxide viscosity

Strontium oxide has moderate viscosity as it has less resistance of the fluid to flow.

Strontium oxide molar density

The molar density of Strontium oxide is 4.70 g/cm3.

Strontium oxide melting point

The melting point of strontium oxide is 2,531 οC or 2,804 K.

Strontium oxide boiling point

The boiling point of strontium oxide is also high that is 3,200 οC or 3,470 K.

Strontium oxide state at room temperature

Strontium oxide exists as a white solid at room temperature. It usually exists in powder form.

Strontium oxide ionic bond

Strontium oxide is an ionic compound consisting of an ionic bond between Sr2+ and O2- ions.

Strontium oxide electronic configuration

Electronic configuration is the arrangement of electrons in various shells of atom in the increasing order of energy. Let us find out the electronic configuration of SrO.

The electronic configuration of Strontium is [Kr] 5s2 and oxygen is [He] 2s2 2p4. In strontium oxide, Sr loses two electrons to form Sr2+ while oxygen gains two electrons to form O2-.

Strontium oxide oxidation state

The oxidation state of strontium +2. The oxidation state of oxygen is -2.

Strontium oxide acidity/alkaline            

Strontium oxide is alkaline in nature. When strontium oxide reacts with water, it forms base strontium hydroxide.

SrO + 2H2O –> Sr(OH)2 + H2

Is Strontium oxide odourless?

Strontium oxide is an odourless white solid.

Is strontium oxide paramagnetic?

Magnetic nature of a molecule depends on whether it contains unpaired electrons. Let us explore whether SrO is paramagnetic or not.

Strontium oxide is diamagnetic in nature. It is repelled by the magnetic field. This is because strontium oxide does not contain unpaired electrons.

Strontium oxide hydrates

The molecular formula of strontium oxide hydrate is H2O2Sr. Monohydrate of SrO has molar mass of 139.65 g/mol and octahydrate has molar mass of 265.76 g/mol.

Strontium oxide crystal structure

Strontium oxide has a cubic crystalline structure.

Strontium oxide polarity and conductivity

  • Strontium oxide is a polar compound because of the difference in electronegativity of strontium and oxygen.
  • Solid strontium oxide does not conduct electricity because electrons are not free in the solid state to conduct electricity.
  • When dissolved in water, it can conduct electricity due to the formation of ions.

Strontium oxide reaction with acid

Strontium oxide reacts with acid to form halide and water. Strontium oxide reacts with HCl to form strontium chloride and water.

SrO(s) + 2HCl(aq)  –> SrCl2(aq) + H2O(l)

Strontium oxide reaction with base

Strontium oxide is a metallic oxide and does not react with a base. The reason is that metallic oxides and hydroxides are bases. One base does not react with another base due to similar properties.

Strontium oxide reaction with oxide

Metallic oxides react with non-metallic oxides to form salt and water. When strontium oxide reacts with carbon dioxide at room temperature, it forms strontium Carbonate.

SrO + CO2 –> SrCO3

Strontium oxide reaction with metal

The reaction between strontium oxide and Aluminium can be represented as,

3SrO + 2Al –> 3Sr + Al2O3


Strontium oxide is a basic oxide. It is diamagnetic in nature. It has cubic crystalline structure.  It is an ionic compound. It is used in glass, ceramics and electronic industries.