The compound formed by sodium and hypochlorite is sodium hypochlorite (NaClO), also known as bleach. It is a widely used chemical compound that finds applications in various industries, including water treatment, textile bleaching, and as a disinfectant and deodorizer. In water treatment, sodium hypochlorite is primarily used for chlorination, which involves adding chlorine to the water to disinfect it and kill harmful microorganisms. This process is crucial in ensuring the safety and quality of drinking water.