You may think that the disposal of acid and bases is as simple as pouring it down the drain. In some scenarios, this may be acceptable but, more often than not, it’s important that you do not
Acids that have a pH level stronger than 2.0 and bases stronger than 12.0 pH are not to be poured directly down the drain, even if plenty of water is used in the process. Instead, they should be sufficiently diluted and/or neutralized until they reach the desired pH level at which they’re no longer too strong to be poured down the drain. When they do reach that level, you should still ensure plenty of water is used when doing so.
If neutralized your acids and bases is unadvisable or they are simply too strong, they can be collected in containers and can be disposed of as hazardous waste. In this scenario, you would need to call Hazardous Waste Experts to come pick these containers up, as the disposal of acid in this example would require professionals.