Question

The waste from a paper factory contains a high amount of hydrochloric acid. How should we treat the waste, before disposal, to make it safe?

• A. Treat it with chemicals containing sodium hydroxide
• B. Treat it with chemicals containing sulphuric acid
• C. Treat it with chemicals containing sodium chloride
• D. Treat it with pure hydrochloric acid

Answer 1

The correct option is A Treat it with chemicals containing sodium hydroxide

If waste from the paper factory which contains a high amount of hydrochloric acid disposed in the water the fishes cannot survive. So, before disposal, the $HCl$ from the waste should be treated with a strong base sodium hydroxide in order to neutralize the acid.