Final answer:
The correct concentration of chlorine on non-porous surfaces is between 100 ppm to 200 ppm; this range is effective for disinfection. To calculate chlorine concentrations in different scenarios, knowledge of chlorine mass or volume and water volume, as well as reaction stoichiometry, is required.
Step-by-step explanation:
The proper concentration of chlorine on non-porous surfaces for disinfection purposes is generally between 100 ppm to 200 ppm. This level is effective for sanitizing and killing bacteria without being overly corrosive or posing significant health risks. In terms of calculating concentrations for different applications, the concentration of chlorine in a solution can be calculated by knowing the mass of chlorine added to a given volume of water. For example, to chlorinate water in pools to a maximum level of 3.0 ppm, the mass of chlorine added depends on the volume of the water in the pool. Similarly, to generate chlorine gas from pool water containing HOCI, the volume needed can be determined by considering the chlorine concentration in the water and the stoichiometry of the chemical reaction involved.