How to Prepare 70% H₂SO₄ Solution for Cotton/Polyester

Purpose: To check the percentage of Cotton & Polyester fiber in blend yarn.


  • Measuring Cylinder
  • Conical Flask
  • H₂SO₄ (M.W-98.08%)
  • Water
  • Glass Reagent Bottle


  1. Accurately weigh about 70 gm of H2SO4 in a Conical Flask.
  2. Take accurately 30ml water in the Measuring Cylinder.
  3. Now mix the solution in a Glass Reagent Bottle.
  4. Complete your process slowly. Remember, The acid must always be added to the water.
  5. Use the solution after the temperature has reached 25°C.




Updated: July 13, 2021 — 9:43 am

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