I just tried following reaction and can't explain what happens chemically.
Could somebody help me on this?
Aqueous solution of KMnO4 added with:
a. a portion of conc. H2SO4 --> reddish solution, which turned yellow after some time.
b. double portion of conc. H2SO4 --> dark red solution, which stayed over time.
Actually in the system I only have: KMnO4, H2O, H2SO4.
In the forum, I found: KMnO4 + H2SO4 + H20 --> KHSO4 + MnO4- + H30+
Is KHSO4 dark red?
Due to color change, I assume that redox reaction took place. Thus, MnO4- --> Mn2+ (in acidic solution), which should be colorless. Then there should be a reducing agent. Is it (SO4)2-??
What could the reddish color be, which turn to yellow?
And what is the dark red color?