Ammonium Thiocyanate (0.1 M)
Molecular formula: NH4SCN
Molecular weight: 76.12
Preparation: Dissolve 7.612 g of ammonium thiocyanate in sufficient water to produce 1000 mL.
Standardization: Pipette 30.0 mL of 0.1 M silver nitrate into a glass stoppered flask, dilute with 50 mL of water, add 2 mL of nitric acid and 2 mL of ferric ammonium sulfate solution, and titrate with the NH4SCN solution to the first appearance of a red-brown color.
AgNO3 + NH4SCN → AgSCN↓ + NH4NO3
NH4SCN + Fe+3 → [FeSCN]+2 + NH4
1 mole of NH4SCN ≅ 1 mole of silver nitrate
1000 mL of 1M NH4SCN ≅ 169.87g of AgNO3
1 mL of 0.1 M NH4SCN ≅ 0.01698 g of AgNO3
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