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Start with your nose:
-eggy/sulphury = sulphuric acid
-vinegary = vinegar
-soapy/detergent = HFThat probably just leaves nitric and hydrochloric as your common acids you’re going to find. Chuck some copper in it. If you get bubbles, it’s nitric, if not it’s hydrochloric or a fruit acid.
Next you’re gonna want some sodium hydroxide drain cleaner from the plumbers merchants. Obvs watch out because this stuff also dissolves skin, mdcc_tester covered this earlier. Neutralise the acid with it and have a taste. Salty? Hydrochloric. Not salty but poisons you? Probably one of the fruit acids.
Foolproof method. Literally nothing can go wrong.
Jonny69
I've got a glass jar with a disposable glove and elastic band acting as a makeshift lid. Contains a clear liquid. It's labelled ACID.
What's the quickest yet somewhat safest way to determine what it is?