✅ Preparation of a sol. of Ammonium Iron(II) Sulfate + Standardisation of Potassium Permanganate
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Last updated 1:25 PM on 6/13/26
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6 Terms
1
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Write an equation to show the redox reaction in this titration
MnO4- + 5Fe2+ + H+ → Mn2+ + 5Fe5+ 4H2O
2
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What indicator is used in this titration?
none, potassium permanganate acts as its own indicator
3
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Why is sulfuric acid added when preparing the ammonium iron (II) sulfate sol.?
to prevent the Fe3+ ions in the ammonium iron (II) sulfate from being prematurely oxidised by oxygen in the air to Fe2+ ions
4
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Why is sulfuric acid added to the conical flask?
to ensure acidic conditions so the Mn+7 ions can be fully reduced to Mn+2
5
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What colour change is observed?
from purple to permanent pink
6
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