What color is permanganate ion?
1 Answer
Permanganate,
It can make for a very colorful laboratory exercise. Take a sample of
#"Cl"^(-)# can be oxidized into#"Cl"_2# , but it tends to take some heating. The light pink goes away when#"MnO"_4^(-)# gets reduced to#"Mn"^(2+)# .
#10"Cl"^(-)(aq) + 16"H"^(+)(aq) + 2"MnO"_4^(-)(aq) -> 5"Cl"_2(l) + 2"Mn"^(2+)(aq) + 8"H"_2"O"(l)#
#"Br"^(-)# can be oxidized to#"Br"_2# , which turns the solution a clear yellow (while the permanganate color disappears).
#10"Br"^(-)(aq) + 16"H"^(+)(aq) + 2"MnO"_4^(-)(aq) -> 5"Br"_2(l) + 2"Mn"^(2+)(aq) + 8"H"_2"O"(l)#
#"I"^(-)# gets oxidized to#"I"_2# even more easily, and becomes a dark yellow, somewhat brown, clear color (while the permanganate color disappears).
#10"I"^(-)(aq) + 16"H"^(+)(aq) + 2"MnO"_4^(-)(aq) -> 5"I"_2(l) + 2"Mn"^(2+)(aq) + 8"H"_2"O"(l)#
Based on what I've just described, how can you order the halides in terms of least to most positive