How pure is chlorine gas considered to be?

Chlorine gas is considered to be nearly pure at a concentration of 100%. This level of purity is essential for various applications, particularly in water treatment processes where chlorine is used as a disinfectant. When chlorine gas is delivered for such purposes, it is crucial to ensure that the concentration is as high as possible, typically around 99.5% or more, to ensure effectiveness in killing pathogens and disinfecting water.

In industrial and laboratory settings, chlorine is often required in its purest form to avoid any interference that impurities could cause in reactions or processes. High purity levels ensure safety, efficiency, and effectiveness in its intended use. Therefore, stating that chlorine gas is considered to be 100% pure aligns with its standard delivery and usage requirements in water treatment and other applications.