Volumetric Analysis

Volumetric Analysis

1. Titrating EDTA with magnesium and calcium ion using eriochrome black T.

   • End point :
   • Red
     • to blue
   • EDTA in the burette
   • Pipette 25ml portions of the magnesium solution under test into a conical flask.
   • Add 10ml of pH10 buffer
   • Add 4/5 drops of the indicator, eriochrome black T. Titrate the ion solution with edta

2. Titrating acidified potassium manganate(VII) with Iron (II)

   • Potassium Manganate (VII) in the burette
   • Pipette 25ml portions of ammonium iron (II) sulfate into a conical flask
   • Add 10ml of dilute sulfuric acid.
   • End point :
     • Colourless
       • to pink

3. Titrating Iodine with sodium thiosulfate ions using starch as an indicator

   • Estimate oxidising agents such as hydrogen peroxide and iodate ions by their reactions with potassium iodide
   • Add the thiosulfate until the solution is straw coloured.
     • Add starch at this point and the solution will change from
       • BLUE-BLACK
         • to colourless