Final answer:
Chemical sanitizers should be mixed with water at the specified concentration according to the manufacturer’s instructions for effective and safe use.
Step-by-step explanation:
Chemical sanitizers are in a concentrated form and should be mixed with water at the specified concentration. This is because each sanitizer has a specific concentration level at which it is effective without being harmful to surfaces or users. The concentration of a solution determines how much of a solute is dissolved in a certain amount of solvent. Terms like dilute or concentrated describe the amount of dissolved solute, but these are relative and must be adequately adjusted based on the sanitizer's guidelines to ensure efficacy and safety. It is crucial to follow the manufacturer's instructions, considering factors like effectiveness against various microbes, safety for the environment and users, and cost.