# How could you dissolve a coating of CaCO3(s) from a metal plate?

A metal plate has an unwanted coating of $\ce{CaCO3(s)}$. You must find a way to clean this metal plate without causing any scratches or abrasion. How might you dissolve the coating?

I know I should find a substance that will dissolve the coating, and then soak the plate in it. How do I determine an appropriate substance?

• Acetic acid, aka vinegar – Gimelist Jan 12 '15 at 6:31

I recommend sulfamic acid with formula $$\ce{H3NSO3}$$. The reaction is irreversible, no dangerous compound:
$$\ce{2 H3NSO3 + CaCO3 -> Ca(H2NSO3)2 + CO2 + H2O}$$