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1. Fill the borosilicate reactor tubes with hydrochloric acid solution (≈25%) using a pipette.

2. Put the tubes vertically in a glass beaker with enough water (see Figure 1). Beware of water overspilling inside the tubes.

3. Place the beaker with the tubes in an ultrasonic bath, with a frequency of approx. 35 KHz and run for 15 minutes at room temperature.

4. Discard the hydrochloric acid from the tubes and rinse them shortly with water.Rinse the tubes 2 to 3 times with acetone (>98%).

5. Let the tubes dry off horizontally for approximately one hour.

6. Place the tubes in a glass beaker. Avoid the tube openings facing upwards in order to prevent any substance getting by gravity into the tubes volume.

7. Heat the beaker and tubes in an oven during 3 hours at 500°C.

8. Once cooled down, close tightly the beaker with tubes using aluminium foil and store in a clean and safe place in your lab.

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WARNING Hydrochloric acid is a strong acid. It can cause severe skin burns and eye damage. Wear suitable protective clothing, gloves and eye/face protection.	Causes severe skin burns and eye damage. Image Modified
WARNING Hydrochloric acid will produce flammable and explosive hydrogen gas when in contact with iron. Furhtermore, adding water to hydrochloric acid produces a violent, exothermic reaction. Be sure to work in a vented fume hood and do not cover the reaction with a lid.	Reacts violently with water. Image Modified
CAUTION Use gloves and safety goggles when working with hydrochloric acid.	Image ModifiedImage Modified