Barium chromate, with the chemical formula BaCrO4, is a chemical compound composed of barium (Ba) cations and chromate (CrO4^2-) anions. It is a yellow crystalline solid that is sparingly soluble in water.

Some key properties and uses of barium chromate include:

1. Pigment: Barium chromate is used as a yellow pigment in certain applications, such as in paints, inks, and plastics.
2. Corrosion Inhibitor: It is used as a corrosion inhibitor in certain materials to protect against corrosion and degradation.
3. Pyrotechnics: Barium chromate is used in pyrotechnic compositions to produce green flames in fireworks and other pyrotechnic displays.
4. Electroplating: It is used in the electroplating industry as a source of chromium for certain plating processes.
5. Laboratory Reagent: Barium chromate is used as a laboratory reagent in various chemical reactions and analytical procedures.

Barium chromate is toxic if ingested, inhaled, or absorbed through the skin, and it should be handled with care. It is also considered harmful to the environment, and its release into water bodies and the environment should be avoided.

As with any chemical, safety precautions should be taken when handling barium chromate. It is essential to work with this compound in a well-ventilated area and use appropriate personal protective equipment to minimize exposure and potential risks. Additionally, proper waste disposal procedures should be followed to prevent environmental contamination. The use of barium chromate is regulated in many countries due to its toxicity and environmental impact.