K2S, or potassium sulfide, is a chemical compound composed of potassium and sulfur. Its formula is K2S, indicating that it contains two potassium (K) atoms for every sulfur (S) atom. K2S is typically a yellowish solid that is soluble in water, forming a solution that can be alkaline. It is often used in various industrial applications, including the production of other chemicals and in agriculture as a fertilizer. In addition to its industrial uses, K2S can also be found in some laboratory settings. It is important to handle potassium sulfide with care, as it can release hydrogen sulfide gas (H2S) when it reacts with acids, which is toxic and has a characteristic rotten egg smell. Proper safety precautions should be taken when working with this compound.