determination of the iron (II) content of lawn fertliser by redox titration

[chopper_3073]

hey guys did this sac today. Few questions

Q1) why is sulfuric acid added to the fertiliser solution before it is titrated with the potassium permanganate solution

Q2) explain why an indicator is not required when a redox titration is performed using KMnO4 solution in the burette?

Q3) suggest why it is usual practice to record the volume of potassium permanganate solution in a burette by reading from the top rather than from the bottom, of the meniscus?

thanks in advance

[Greatness]

1) H+ ions come from the sulfuric acid which is required for the permanganate to react
2) MOST redox reactions do not need an indicator as they have a spontaneous change of colour when the equivalence/end point is reached.
3) Potassium permanganate solution is very dark thus it's hard to read the volume from the bottom of the meniscus. Therefore we read the meniscus from the top.

[chopper_3073]

thanks