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Preparation and Standardization of 0.0167 M Potassium Dichromate

Preparation and standardisation of 0.0167 M Potassium Dichromate solution using Sodium Thiosulphate and Starch solution as indicator used for analysis of pharmaceutical ingredients.

Potassium Dichromate Solution Preparation

  • Weigh 4.9 g of potassium dichromate, previously powdered and dried in a desiccator for 4 hours.
  • Dissolve in sufficient water to produce 1000 ml. Standardize the solution in the following manner.

Potassium Dichromate Solution Standardization

  • To 20.0 ml of the solution add 1 g of potassium iodide and 7 ml of 2 M hydrochloric acid.
  • Add 250 ml of water and titrate with 0.1 M sodium thiosulphate, using 3 ml of starch solution, added towards the end point of the titration, as indicator until the color changes from blue to light green.
  • 1 ml of 0.1 M sodium thiosulphate is equivalent to 0.0049 g of K2Cr2O7.
Also see: Determination of Shelf Life of Solutions in Laboratory

Ankur Choudhary is India's first professional pharmaceutical blogger, author and founder of, a widely-read pharmaceutical blog since 2008. Sign-up for the free email updates for your daily dose of pharmaceutical tips.
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