Final answer:
It is true that solutions that are under-diluted can leave behind toxic residues harmful to humans. Proper dilution is necessary to ensure safe concentrations of chemicals like pesticides, preventing health risks associated with exposure to highly concentrated toxic chemicals.
Step-by-step explanation:
True, solutions that are under-diluted may indeed leave toxic residues that are harmful to humans who come into contact with them. In the context of environmental health, substances such as pesticides or heavy metals need to be diluted properly before use to prevent toxic concentrations from remaining on treated surfaces, which can be hazardous. When these substances are not diluted according to the recommended guidelines, they can remain in a highly concentrated form that is capable of causing harm to humans and the environment. Dilution is a vital process for maintaining safe levels of various chemicals and ensuring that they do not pose a health risk. For instance, in agriculture, pesticides must be diluted to levels that are effective yet non-harmful to humans, animals, and the environment. Similarly, in a laboratory setting, reagents must be prepared at safe concentrations to prevent toxicity. The risks of exposure to toxic chemicals are well-documented, as they can accumulate in tissues and lead to a variety of health issues, including but not limited to developmental defects, cancer, and organ damage.