[cricketabstain]

I had sodium hydrogen sulfate dissolved into water with a bit of sulfur powder added into the mixture plus sodium hydrogen sulfate. There were a lot of gas bubbles and the litmus strip turned bright red. The interesting part of everything was that I decided to clean a test tube that I had with the acid I had made. In that test tube was previously molten potassium permanganate and sodium hydrogen sulfate. When I poured the acid in, there were bubbles and then I dribbled a drop of the solution onto a litmus strip. The solution ate its way through the strip turning it a very bright red. What was the resulting acid and its byproducts? Thanks.