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Making TeO2, Telluropentathionic Acid, Sodium Tellurite/Tellurate, and 6 Transition Metal Tellurites

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First published at 03:18 UTC on February 13th, 2020.

#tellurium
#tellurite
#tellurate

poormanschemist

PoorMansChemist

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In this video I make tellurium dioxide from tellurium metal. At first I had some difficulty (passivation) when trying to dissolve it in 47% HNO3 so I took the crude TeO2 and reacted that with boiling 88% H2SO4. This allowed easy separation of the remaining Te and the TeO2. Then I reacted a small amount of the TeO2 with sodium thiosulfate and HCl to make telluropentathionic acid. Next I dissolved the TeO2 in aqueous NaOH to make sodium tellurite. A portion of that was oxidized with 3% H2O2 to sodium tellurate (synthesis confirmed using the same tellurate test I did a clip video on previously). Then the remaining tellurite solution was precipitated out using six different transition metal cations: Mn(II), Co(II), Ag(I), Cr(III), Cd(II), and Cu(II).

Atomistry Article on..
Tellurium Chemistry: http://tellurium.atomistry.com/chemical_properties_tellurium.html
Tellurium Dioxide: http://tellurium.atomistry.com/tellurium_dioxide.html
Basic Tellurium Nitrate:http://tellurium.atomistry.com/basic_tellurium_nitrate.html
Tellurium Sulfate:http://tellurium.atomistry.com/tellurium_sulphates.html
Tellurites: http://tellurium.atomistry.com/tellurites.html
Tellurates: http://tellurium.atomistry.com/tellurates.html
Telluropentathionic Acid: http://tellurium.atomistry.com/telluropentathionic_acid.html

Rhodanide's Video on Tellurium Decaoxotrisulfate: https://www.youtube.com/watch?v=sd-i0WOPEz8
Tellurate Test Video: https://www.youtube.com/watch?v=-61zjsy14d4
The test for the tellurate ion is taken from "Spot Tests in Inorganic Analysis" by Feigl & Anger, 1972, page 471. This book can be downloaded for free from: https://b-ok.cc/book/2218954/0947ce

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