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Potassium Thiocyanate solution can also be used to standardize Mercuric Nitrate solutions using Ferric Alum as the indicator:
2 KSCN + Hg(NO3)2 → Hg(SCN)2 (white precipitate) + 2 KNO3
excess SCN- + Fe3+ → [FeSCN]2+ (red complex at endpoint)
Ammonium Thiocyanate and Potassium Thiocyanate solutions can be used interchangeably in these determinations.
The reactions for this Volhard titration are:
X- + excess AgNO3 → AgX (precipitate) + AgNO3
X = Cl, Br, I
KSCN + AgNO3 → AgSCN (white precipitate) + KNO3
excess SCN- + Fe3+ → [FeSCN]2+ (red complex at endpoint)
Potassium Thiocyanate
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