What is hydrochloric acid required for?
Well, it really depends on what you’re looking for. HCl (aka Hydrochloric acid) is found naturally in gastric acid, so you could say it is required for natural digestion and other gastric processes. It is also common in household and industrial cleaning products, so it’s useful there… Does that help? You might not want to drink or play with the stuff, by the way. It’s a very strong acid and very harmful. But yeah, if that’s a school question, it’s probably asking about it being a natural component in gastric acid. Good luck!