Potassium molybdate is an inorganic compound with the chemical formula K₂MoO₄. It is a white or yellowish crystal that dissolves in water to form a colorless or yellowish solution. Potassium molybdate is a molybdenum-containing salt that belongs to the molybdate class of compounds.

1. Industrial Uses:

   - As an additive to lubricants, it improves lubricity and prevents corrosion.

   - In the metallurgical industry, as a raw material for molybdenum, it is used in the production of alloy steel and stainless steel.

   - Used in the production of dyes and pigments, e.g. as an ingredient in molybdenum yellow.

2. Agricultural Uses:

   - As a trace element fertilizer, it provides molybdenum needed for plant growth and promotes the fixation and utilization of nitrogen by plants.

3. Medical Uses:

   - In the medical field, potassium molybdate can be used in the preparation of the radioisotope 99mTc, a radiotracer widely used in nuclear medicine diagnostics.

4. Scientific Purpose:

   - As a chemical reagent for analytical and synthetic chemistry in the laboratory.

5. Environmental Protection:

   - Used in the treatment of industrial wastewater to help remove heavy metal ions.