Which chemical method treats a liquid substance so that it results in solid material?

The method of solidification is specifically designed to convert a liquid substance into a solid form. This process often involves the use of additives or changes in conditions that facilitate the transformation of liquid into solid material, effectively immobilizing the hazardous substance and preventing further leaching or contamination. Solidification can be particularly useful in remediating hazardous waste, as it allows for easier handling, transport, and disposal of materials that were once liquid and potentially hazardous.

Neutralization pertains to the chemical reaction where acids and bases are neutralized to form salt, water, and other by-products, but it does not necessarily lead to solidifying the substance. Isolation refers to the strategy of enclosing a hazardous material to prevent exposure or further spread, which doesn’t result in solidification. Containment involves the physical measures taken to keep hazardous materials within a certain area, but does not change the state of the material from liquid to solid. Thus, solidification is the only method mentioned that transforms the state of a liquid substance into a solid form.