I would like to test for the reaction between carbonic acid and copper (to simulate the effect of acid rain on copper). However, I find that many supplies failed to provide carbonic acid (either in powder or liquid form). Some says that carbonic acid is unstable and thus cannot supply it. Therefore, I want to make it myself. Are there any simple ways to make carbonic acid from other chemicals (e.g. sodium carbonate?).
Also, I have found some carbonic acid powder in some commercial product such as this one.
But it is for bathing instead of chemical use. Can they produce carbonic acid?
Any answers and comments are welcome. Thank you very much for helping.