Alright, so its a titration between FeSO4 and KMnO4.
I think you thought that the colour change is from pale green to rusty brown. But instead of rusty brown its pink. The reason is this.
Practically, if you do this titration, you would get punk at the point. This is because you add phosphoric acid into the analyte which makes the rusty brown Fe3+ being formed to appear colourless.
I think you thought that the colour change is from pale green to rusty brown. But instead of rusty brown its pink. The reason is this.
Practically, if you do this titration, you would get punk at the point. This is because you add phosphoric acid into the analyte which makes the rusty brown Fe3+ being formed to appear colourless.
P2O5 is the formula