Once the equipment is on, you can start:
- Pour the water into a container at the quantity / mass indicated by the calculator. Water having a density of 1, you can use the scale to be precise in the measurements.
- Weigh the soda in another container to the mass indicated by the calculator. This measure must be as precise as possible. Better to add less soda than too much, to make a soap too fat rather than too basic. If you add the soda directly into the water you will not be able to remove material and correct a too big addition.
- Gently add the weighed soda to the volume of water and stir gently avoiding any projection. The solution heats up, it's normal.
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