Week 3

Preparation of a solution (antiseptic) for a sanitizer.

It is recommended to prepare a solution (antiseptic) under the guidance of a teacher and use personal protective equipment (glove and mask)! Carefully study the safety regulations for working with chemical glassware and reagents! It is not recommended to use pure (100%) alcohol!

Step 1. Prepare all the necessary materials

– ethyl alcohol, C2H5OH (concentration 80-90%) – 240ml

– glycerin, C3H5(OH)3 – 5 ml

– hydrogen peroxide Н2О2  – 15 ml

– distilled water – 35 ml

– syringe / or measuring dispenser

– a container with a lid, for preparing a solution, 0.3L

Step 2. Pour 240 ml of ethyl alcohol into a container (with a lid), then add hydrogen peroxide (15 ml).

Step 3. Add glycerin (5 ml), after rinsing the measuring cup with chilled boiled water. This is a necessary condition since glycerin sticks to the container

Step 4. Add distilled water. Close the lid and shake the solution.

Step 5. For ease of use, pour the antiseptic into small containers. After that, the resulting solution must be left for 72 hours. This will kill harmful microorganisms that could get into the antiseptic at the time of preparation.

It is necessary to sign (write the name of the liquid on the bottle) the prepared solution. Such measures are necessary for safety.

ATTENTION!!!  The prepared solution is a volatile liquid with a characteristic odor, as it contains ethyl alcohol. When designing a sanitizer, it is recommended to use a wide container with a lid and calculate its dimensions (make a hole on the lid for the hose and wire, then seal it using hot glue gun).