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Recipe of the Week – Week 28: Biuret Solution

Biuret Solution

Continuing our new series of chemical recipes, we bring you week 28 – Biuret Solution (C2H5N3O2)

Remember that when preparing any of our recipes, you should:

  • Always wear appropriate PPE including eye protection and gloves.
  • Always add acid to water (never water to acid).
  • Use a fume cupboard.
  • Always carry out a risk assessment when using any chemicals.
  • Follow all recommended safety procedures and adhere to the label instructions, hazard warnings and local legislations.


  1. Dissolve 1.5g copper(II) sulphate-5-water and 6g potassium sodium tartrate in 500ml water.
  2. Stir in 375ml of 1M sodium hydroxide solution (CORROSIVE), stirring continuously.
  3. If a precipitate appears, add 1g potassium iodide, then dilute to 1000ml with water.
  4. Bottle and label as necessary. The solution is a deep blue colour.

Download the PDF recipe

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Scan the QR codes for classroom experiments to follow with your biuret solution.