Potassium Thiocyanate
Product code RXSOL-62-6126-050
Potassium Thiocyanate solution also used to determine Chloride, Bromide and Iodide in presence of Silver Nitrate with Potassium Thiocyanate titrant using a Ferric Alum Indicator.
Description
Potassium Thiocyanate solution can be used in titrations involving Silver Nitrate solutions. Chloride, Bromide and Iodide can be determined indirectly this way by adding excess Silver Nitrate solution to the sample containing the Halide, thus precipitating the Halide, and titrating the excess Silver Nitrate with Potassium Thiocyanate titrant using a Ferric Alum Indicator.
Application
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)