K2TeO4

K2TeO4 is the potassium salt of the tellurate anion TeO4^2-, in which tellurium is in the +6 oxidation state. The compound is a white, odorless crystalline solid that is soluble in water. In aqueous solution, TeO4^2- is the dominant species, with tellurate speciation influenced by pH and concentration; under strongly basic conditions, polymeric tellurate species can form.

K2TeO4 can be prepared by neutralizing telluric acid with potassium hydroxide, followed by crystallization of the salt. Additional preparation routes involve oxidation of tellurium-containing species in a potassium-containing basic medium.

In inorganic synthesis, K2TeO4 serves as a source of tellurate (Te(VI)) and is used to prepare other potassium tellurates and related tellurium(VI) oxyanions. In solution, it can act as a mild oxidizing agent, and redox transformations between Te(VI) and Te(IV) are possible under suitable conditions.

Safety and handling: Tellurate compounds should be handled with standard laboratory precautions. They may be harmful if ingested or inhaled and should be stored away from moisture and incompatible reagents. Proper disposal and eye/skin protection are recommended when working with this compound.