Volumetric Analysis

Question 1

Fe2+ and MnO4- equation

Answer 1

MnO4- + 5Fe2+ + 8H+
->
5Fe3+ + Mn2+ + 4H2O

Question 2

Manganate colour change

Answer 2

Colourless to pink

Question 3

Iodate(V) half equation

Answer 3

2IO3- + 12H+ + 10e-
->
I2 + 6H2O

Question 4

Iodide Half equation

Answer 4

2I- -> I2 + 2e-

Question 5

Equation for liberated iodine with thiosulfate

Answer 5

I2 + 2(S2O3)2-
->
2I- + (S4O6)2-

Question 6

Iodine and thiosulfate colour change

Answer 6

Brown- straw colour
-add starch solution-
Straw - blue-black

Question 7

Iodide and hydrogen peroxide equation

Answer 7

2I- + H2O2 + 2H+
->
I2 + 2H2O