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Tin Dioxide – SnO2 – Cassiterite – 99 % – 100 g

Chemical formula: SnO2


Synonyms: tin (IV) oxide, stannic oxide, Cassiterite (mineral)

Amount: 100 g

Appearance and odour: off-white/greyish coarse powder without appreciable odour.

Grade: 99 or more %

Packaging: professional wide necked, white HDPE bottle with blue conical seal cap and tamper ring. Labelled. Bottle and cap are UN approved and reusable.

Description and uses:

Glowing with excess charcoal (carbon) reduces the oxide to pure tin:

SnO2(s) + 2 C(s) → Sn(l) + 2 CO(g)

SnO2(s) + 2 CO(g) → Sn(l) + 2 CO2(g)

It contains 79 % tin metal.

Tin dioxide is also used in pottery glazes, as a pigment.

Tin dioxide is insoluble in most dilute or concentrated acids, unless it has been freshly precipitated.

Fusing with strong alkali (NaOH or KOH) forms stannates:
2 NaOH + SnO2 + 2 H2O → Na2Sn(OH)6

Which can be crystallised from water. Here tin demonstrates its amphoteric character.

Neutralisation of stannate solution with strong acids causes Sn(OH)4.nH2O to precipitate, which when freshly produced dissolves in strong HCl to give hexachloro stannic acid, H2SnCl6. Adding NH4Cl and reducing the solution causes ammonium hexachloro stannate ((NH4)2SnCl6), aka ‘Pink Salt’, to crystallise. Pink Salt was once widely used as a dye mordant (fixer) for vivid pink dyes.

Hexachlorostannate salts can be reduced to Sn (II), the lower oxidation state known as ‘stannous’, with zinc, aluminium or magnesium. Neutralising the reduced salt with strong ammonia causes stannous hydroxide (Sn(OH)2.H2O) to precipitate. This, after isolation, is a precursor for most stannous (Sn (II)) salts.

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CAS: 18282-10-5

Price: £6.99