Tin(II) oxide

Tin(II) oxide, also known as stannous oxide, is a chemical compound. Its chemical formula is SnO. It has tin in an oxidation state of +2. It also has oxide ions in it.

Tin(II) oxide

Names
IUPAC name Tin(II) oxide
Other names Stannous oxide, tin monoxide
Identifiers
CAS Number	21651-19-4 Y
3D model (JSmol)	Interactive image
ECHA InfoCard	100.040.439
EC Number	244-499-5
PubChem CID	88989
RTECS number	XQ3700000
CompTox Dashboard (EPA)	DTXSID2066723
SMILES O=[Sn]
Properties
Chemical formula	SnO
Molar mass	134.709 g/mol
Appearance	black or red powder when anhydrous, white when hydrated
Density	6.45 g/cm3
Melting point	1,080 °C (1,980 °F; 1,350 K)
Solubility in water	insoluble
Magnetic susceptibility (χ)	−19.0·10−6 cm3/mol
Structure
Crystal structure	tetragonal
Thermochemistry
Std enthalpy of formation ΔfHo298	−285 kJ·mol−1
Standard molar entropy So298	56 J·mol−1·K−1
Hazards
Flash point	Non-flammable
U.S. Permissible exposure limit (PEL)	none
Related compounds
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Other cations	{{{value}}}
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Properties

It is normally a blue-black solid. It can be red but the red form is more unstable. It burns in air with a green flame to make tin(IV) oxide. It is a reducing agent. It is rarer than tin(IV) oxide. It dissolves in acids to make a colorless solution.

Preparation

It can be made by reacting sulfuric acid with tin and reacting the tin(II) sulfate made with sodium hydroxide to make the tin(II) oxide hydrate. This is heated to get the tin(II) oxide.

Uses

It is used in touchscreens. It is used to make a glass with gold in it called ruby glass.

Related pages

• Tin(II) chloride