K3SeO3
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The chemical formula for potassium selenite is K2SeO3. It contains one potassium ion (K+) and one selenite ion (SeO3^2-), which combine in a 2:1 ratio.
Selenite is not an element. It is a mineral composed of calcium sulfate, which is a compound made up of calcium, sulfur, and oxygen atoms. The chemical formula for selenite is CaSO4·2H2O.
The formula for potassium sulfide is K2S.
The formula for potassium arsenate is K3AsO4.
The chemical formula for potassium phosphate is K3PO4.
The chemical formula for potassium dichloride is KCl2.