Estimation Of Iron In An Iron Tablet Flashcards
1
Q
Why do you need to standardise something?
A
To find conc.
2
Q
Why was it necessary to standardise the potassium manganate solution immediately before use in the titration?
A
Unstable and affected by light
Decomposes in presence of heat
3
Q
What reagent is used to standardise potassium manganate immediately before use?
A
Ammonium iron II sulfate
4
Q
Explain why additional dilute sulfuric acid must be added to the titration flask before each titration is carried out
A
To ensure complete conversion of MnO4- to Mn2+
5
Q
Why is some dilute sulfuric acid used to make the 250cm3 solution?
A
To prevent the oxidation by air of Fe2+
6
Q
What’s the colour change?
A
Colourless to pink
