Redox Titrations Flashcards
1
Q
Manganate ion
A
MnO4-
2
Q
Colour change of MnO4- to Mn2+
A
purple -> colourless
3
Q
How can we tell that a titration involving KMnO4 is complete?
A
Solution in conical flask turns purple.
Because MnO4- ions are now in excess and no longer being reduced to Mn2+.
4
Q
Mole ratio of MnO4- to Fe2+
A
1 mole of MnO4- reacts with 5 moles of Fe2+
5
Q
Mole ratio of MnO4- to H2O2
A
2 moles of MnO4- reacts with 5 moles of H2O2
6
Q
Thiosulfate ion
A
S2O3 2-
7
Q
Mole ratio of I2 to 2S2O3 2-
A
1 mole of I2 reacts with 2 moles of S2O3 2-
8
Q
What indicator can we use for iodine/thiosulfate titration?
A
I2 is purple in presence of starch.
Starch can be used as an indicator.
9
Q
Mole ratio of Fe2+ to Cr2O7 2-
A
1 mole of Cr2O7 2- reacts with 6 moles of Fe2+.
10
Q
Colour change when Cr2O7 2- reduced to Cr3+
A
orange -> green
