Question

why acids are not stored in a metal container

Answer 1

if acids are stored in metal containers they react with them releasing hydrochemical acids so they are not stored in metal containers

Answer 2

 It is not safe to store acids in metal containers because some acids can damage the containers by corroding them.They readily react with the metal and forms a salt and liberates hydrogen gas.This is why it's not stored in metal containers! And this is why some are stored in glass containers and some are stored in plastic containers!!
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