Introduction: For dyeing in textile it is very essential to know the hardness of water. The pre-treatment and also dyeing process face more problem for more hardness of water. So before run the dyeing process should control the hardness of water. Otherwise the result will not good for the product.

Essential Apparatus & Chemicals :

^1.        EDTA Solⁿ

^2.        Black T Solⁿ (Indicator)

^3.        Burette

^4.        Pipette

^5.        Conical Flask

^6.        Ammonia Buffer Solⁿ

Working Procedure :

• EDTA Solⁿ Preparation: 3.72 g mixed with 1000 mL distilled water.
• Black-T Solⁿ Preparation: 1 g Black-T powder mixed with 100 mL distilled water.

Burette filled with 50 mL EDTA solution.

Conical flask filled with 100 mL sample water and 5 mL Ammonia Buffer solution and 3 drops of Black-T indicator. The color of the solution will be purple.

Result: Color of the solution of conical flask turn into pure blue from purple.

Take the reading from burette scale.

If the reading is less than 2 then it is ok for work (basically dyeing and white gmts).

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