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Stannate

Stannate refers to salts and esters of the stannate(IV) anion, containing tin in the +4 oxidation state. The principal anion is orthostannate, [SnO3]2−, which forms when tin(IV) oxide dissolves in strongly basic solutions, for example SnO2 + 2 NaOH → Na2SnO3 + H2O. In aqueous solution, the tin–oxygen system can exist as various hydroxy-stannate species that depend on pH, such as [Sn(OH)6]2− under highly basic conditions.

Stannates are typically basic and form soluble alkali metal salts (for instance, sodium or potassium stannates).

Common uses of stannates include corrosion inhibition and protection in metal systems, where sodium stannate acts

Safety and handling guidelines for stannates follow general practices for inorganic salts: they are typically of

See also: stannic acid, stannates in ceramics, poly-stannates.

They
may
hydrolyze
and
rearrange
with
changes
in
pH,
and
on
heating
they
can
decompose
to
tin(IV)
oxide
or
hydrated
tin
oxides.
In
acidic
solutions,
stannates
are
converted
to
tin(IV)
oxyacids
and
eventually
to
tin
dioxide
hydrates.
as
a
passivating
agent
in
coolants
and
pretreatment
baths.
They
also
serve
as
fluxes
in
soldering
and
brazing,
stabilizers
in
certain
glazes
and
ceramic
formulations,
and
as
additives
in
glass
processing
to
improve
durability
and
resistance
to
corrosion.
low
to
moderate
toxicity,
with
standard
precautions
for
powder
handling
and
routine
laboratory
or
industrial
hygiene
practices.