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Hot concentrated sulfuric acid dissolves metallic copper and silver. Dilute sulfuric acid dissolves iron. Though I am curious to hear the answer.

Question: I always considered concentrated sulfuric acid to be 98%. Is it still considered concentrated at 70%?

[QUOTE="geedigity, post: 272894, member: 36395"] Hot concentrated sulfuric acid dissolves metallic copper and silver. Dilute sulfuric acid dissolves iron. Though I am curious to hear the answer. Question: I always considered concentrated sulfuric acid to be 98%. Is it still considered concentrated at 70%? [/QUOTE]

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