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1. Weight 175,32 mg ultrapure NaCl with a microbalance.

2. Transfer quantitatively NaCl in a 1 L clean volumetric flask.

3. Add 950 mL demineralized water.

4. Put the flask in a thermostat at 20 0C and maintain for 30 min.

5. Add demineralized water to the mark.

6. Stir the flask.

7. Transfer the solution in a clean and dry bottle of glass, PE, PP.

8. Add the necessary label: date, name of the solution, operator.

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