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15 cards from this deck
Finding exact concentration by titrating against known standard
Substance of known concentration
Stable, doesn't absorb moisture, high molar mass
Prevents oxidation of Fe2+\text{Fe}^{2+}Fe2+ to Fe3+\text{Fe}^{3+}Fe3+
Provides H+\text{H}^+H+ ions for permanganate reduction
KMnO4\text{KMnO}_4KMnO4 acts as its own indicator
Permanent faint pink colour
Reaction speeds up as Mn2+\text{Mn}^{2+}Mn2+ ions form
1:5
Should agree within 0.1 cm3\text{cm}^3cm3
Insufficient acid added
Prevents dilution by residual water
Concentration changes over time due to decomposition
Fe2+→Fe3++e−\text{Fe}^{2+} \to \text{Fe}^{3+} + e^-Fe2+→Fe3++e−
About 20 times
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