At times the focus of your acid is a factor for it to get strongly oxidizing. Again, copper has no reaction with dilute sulfuric acid, but in concentrated sulfuric acid, the remarkably acidic atmosphere and superior concentration of sulfate ions enable the sulfate ions to work as an oxidizing agent. https://laneibeym.blog-mall.com/29283502/caluanie-muelear-oxidize-cas-no-fundamentals-explained