Step 1: Formation of Silver Chloride
Add an aqueous solution of silver nitrate to the mixture containing potassium thiocyanate and iron III chloride. Silver nitrate will react with potassium thiocyanate to form silver thiocyanate (AgSCN) as a white precipitate.
AgNO3 + KSCN → AgSCN (↓) + KNO3
Step 2: Filtration
Filter the mixture to separate the solid silver thiocyanate precipitate from the liquid solution containing potassium nitrate and iron III chloride.
Step 3: Separation of Iron III Chloride and Potassium Nitrate
To separate iron III chloride from potassium nitrate in the filtrate, you can use the difference in their solubility in different solvents.
- Add a suitable organic solvent, such as diethyl ether or ethyl acetate, to the filtrate.
- Iron III chloride is soluble in diethyl ether or ethyl acetate, while potassium nitrate is not.
- Shake the mixture thoroughly to extract the iron III chloride into the organic solvent.
Step 4: Separation of Organic and Aqueous Layers
Use a separating funnel to separate the organic layer (containing iron III chloride) from the aqueous layer (containing potassium nitrate).
Step 5: Evaporation of Organic Solvent
Transfer the organic layer to a separate container and evaporate the organic solvent using a gentle heat source. This will leave behind the iron III chloride as a solid.
Step 6: Recovery of Potassium Nitrate
The aqueous layer from Step 4 contains potassium nitrate. You can recover potassium nitrate by evaporating the water using a gentle heat source. This will leave behind potassium nitrate as a solid.
By following these steps, you can effectively separate potassium thiocyanate, silver nitrate, and iron III chloride from the mixture.
