Things You'll Need

Instructions

1

Pour a pound of baking soda (sodium bicarbonate, available commercially in grocery stores) onto a cookie sheet. Spread it out so it heats evenly.
2

Heat the baking soda for an hour at 300 degrees F.
3

Pour the washing soda into a jar and seal tightly. It becomes more alkaline when heated, so use gloves to handle it or transfer it with a spoon.