[ajax0604]

My textbook says that depending on the temperature and concentration of concentrated sulfuric acid, SO₂, S or H₂S can be produced when it reacts with metals. I've looked at various sources but can't find information on what temperature and concentration are required for each situation. Thank you.

[Borek]

That's because there are no simple rules - it depends on many factors, and in fact the only way of checking how the particular sample of metal reacts in given conditions is to do the experiment.

[ajax0604]

If the temperature and pressure were kept constant, would you need to use hotter and more concentrated sulfuric acid to produce H₂S instead of SO₂?