How was sulfuric acid made in the sixteenth and seventeenth centuries from iron sulfate?

Answer 1

it wasnt...

Answer 2

In the sixteenth and seventeenth centuries, sulfuric acid was made from iron sulfate by a process known as the "lead chamber process." This involved reacting iron sulfate with nitric acid and then heating the resulting mixture in lead chambers along with steam and sulfur dioxide to produce sulfuric acid through a series of chemical reactions. The lead chamber process was the primary method for sulfuric acid production until the mid-nineteenth century.