What happens if you mix sodium hydrogen carbonate with sodium hydrogen sulfate? When I did it, it gave off a lot of gas bubbles (I originally had sodium hydrogen sulfate and sulfur powder mixed with water) and it produced a very strong acid. My litmus strip turned a very bright red. I need to know the bi products and the resulting acid. Thanks

NaHSO4 is the conjugate base of sulfuric acid but is very nearly a strong acid in it's own right. So what you saw is the typical Bicarb / acid reaction producing CO2 gas.

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.