# Why Peroxydisulphuric Acid is also called as Marshall's Acid and Peroxymonosulphuric Acid as Caro's Acid? [closed]

I recently come across the oxaacids of Sulphur and got to know to Acids, $$\ce{H2S2O8}$$ and $$\ce{H2SO5}$$ as Marshall's Acid and Caro's Acid respectively, but I am just eager to know why they are named respectively so.

I tried searching in Google and couldn't found any relevant information regarding the same.

• It is named after respective chemists who discovered it. – Nilay Ghosh Jun 4 at 13:59
• @NilayGhosh, It is not necessary that they "discovered" it. You will have to check the original papers from 1890s! In the very first line he says that Bertholet described it initially. – M. Farooq Jun 4 at 17:36

Caro’s acid:$$\ce{H2SO5}$$, named for the German chemist Heinrich Caro (1834-1910)
Marshall’s acid: $$\ce{H2S2O8}$$, named for the 19th century Scottish chemist Hugh Marshall