Determining the optimal concentration of a catalyst is a balancing act. Too little catalyst may not provide sufficient active sites, resulting in a slower reaction. Conversely, too much catalyst may lead to _diminishing returns_ and increased costs without a corresponding increase in reaction rate.
The optimal concentration depends on several factors, including the nature of the reaction, the properties of the catalyst, and the conditions under which the reaction is carried out. Experimental optimization and _kinetic modeling_ are often used to determine the best concentration for a given system.
