Briefly explain why excess HCl and NaOH solutions must be collected for treatment before disposal, but the titration solution from a completed titration can be safely poured into the drain, diluting with a large amount of water.
Chemical Hazards and Waste Disposal:
It is safe to assume that all chemicals are hazardous. However, the concentration and nature of chemical majorly influenced the level of chemical hazard. Thus, it is important to know the identity of the chemicals handled and to read the material safety data sheet (MSDS) of the chemical. The proper handling, storage and disposal of chemicals can be read in the MSDS.
Answer and Explanation:
Based on the material safety data sheet (MSDS) of HCl and NaOH, HCl and NaOH are corrosive chemicals. These have very low and very high pH, respectively. These can cause eye, skin and respiratory irritation. Thus, these chemicals must be safely disposed of. However, titration solutions from a completed titration is not very dangerous and can be directly poured into the drain as titration solutions are (almost) neutral solutions because of the neutral salt and water produced in the titration.
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from Environmental Science 101: Environment and HumanityChapter 12 / Lesson 7