K2CrO4

Potassium chromate is an inorganic chemical compound with the formula K2CrO4. It is a bright yellow solid at room temperature. It is a salt formed from potassium cations (K+) and chromate anions (CrO4^2-). Potassium chromate is soluble in water, forming a yellow solution.

This compound is typically prepared by the reaction of potassium dichromate (K2Cr2O7) with potassium hydroxide (KOH) or by heating potassium dichromate with potassium carbonate (K2CO3). It is an oxidizing agent, although less potent than dichromates.

Historically, potassium chromate has been used as a pigment due to its vibrant yellow color. It has also found applications in dyeing and printing textiles, as well as in analytical chemistry as an indicator for the presence of silver ions in the Mohr titration. However, due to the toxicity of hexavalent chromium compounds, its use in consumer products has been significantly reduced.

Potassium chromate is considered toxic and an irritant. Exposure can cause skin irritation, allergic reactions, and respiratory problems. It is also a suspected carcinogen. Proper handling and safety precautions are necessary when working with this chemical.