SnO2 - Tin Oxide

What is Tin Oxide?

The inorganic compound tin(IV) oxide, also known as stannic oxide, has the formula SnO2. Cassiterite is a tin oxide mineral, SnO2, and it is the most common tin ore. Tin metal is burned in the air to create synthetic tin(IV) oxide. The annual production is in the kilotons scale.

In a reverberatory furnace at 1200–1300 °C, SnO2 is reduced to metal with carbon. Tin(iv) oxide is a crystalline solid or powder that is white or off-white. Sublime: 1800-1900°C, mp: 1127°C, density: 6.95 g/cm3 Water doesn’t remove it. It can dissolve in hydrochloric acid and concentrated sulphuric acid.

Other names – Stannic oxide

SnO2 Tin Oxide
Density 6.95 g/cm³
Molecular Weight/ Molar Mass 150.71 g/mol
pH (6–12)
Melting Point 1,630 °C
Chemical Formula SnO2

Table of Contents

Tin Oxide Structure – SnO2

SnO2 - Tin Oxide

Physical Properties of Tin Oxide – SnO2

Odour Odourless
Appearance Yellowish or light grey powder
Covalently-Bonded Unit 2
Heavy Atom Count 3
Hydrogen Bond Acceptor 2
Solubility insoluble in water

Chemical Properties of Tin Oxide – SnO2

    • Sulfate is formed when SnO2 dissolves in sulphuric acid. The chemical equation is given below.

SnO2 + 2 H2SO4 → Sn(SO4)2 + 2 H2O

    • When tin(IV) oxide reacts with sodium hydroxide, stannate (IV) sodium and water are formed. At a temperature of 350-400°C, this reaction takes place. The chemical equation is given below.

SnO2 + 2NaOH → Na2SnO3 + H2O

Uses of Tin Oxide – SnO2

  • Tin oxide, which has a +4 oxidation state, can be used to make ceramic bodies opaque, as a mild abrasive, and as a fabric weighting agent.
  • The cosmetics ingredient review has determined that tin oxide is a healthy ingredient, based on the fact that it is not easily absorbed through the skin.
  • Tin oxide is used in dentistry and to render a precious metal polishing paste for high polishing of amalgam and precious metals when combined with water.

Frequently Asked Questions – FAQs


Is SnO2 tin oxide?

Tin(IV) oxide, also known as stannic oxide, is the inorganic compound with the formula SnO2.

How is SnO2 formed?

Crystalline SnO2 starts to form when annealed at 200 °C and becomes dominant only after annealing at 300 °C. It is thus suggested that the SnO2 shell formation, from decomposition/oxidation of hydrates, is a result of a strong interaction between the metal oxide and SiO2 surface.

Is SnO2 acidic or basic?

SnO2 reacts with acid as well as the base. So SnO2 is amphoteric.

How do you dissolve SnO2?

Tin dioxide, SnO2, can be reactively dissolved by soaking in hot aqueous solutions of HBr or HCl (approx. 6 N) to which metallic chromium and/or zinc are also added (as needed).
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