How to Convert Baking Soda into Washing Soda

In some past videos I talk about the difference between Washing Soda (sodium carbonate) and Baking Soda (sodium bicarbonate), and how the two are not interchangeable in soap and other recipes. In some of the hygiene videos I also talk about how hard it is to find Washing Soda at the big box chain stores. I have been looking for a way to get around this, and the solution (once I figured out the right search terms) was surprising simple.
Basically, the difference between baking soda and washing soda is water and carbon dioxide.
Baking soda's chemical makeup is NaHCO3 (1 sodium, 1 hydrogen, one carbon, and 3 oxygen molecules).
Washing soda's chemical makeup is Na2CO3 (2 sodium, 1 carbon, and 3 oxygen molecules).
When you add heat energy, baking soda breaks down to release steam and carbon dioxide from the soda and what you have left is washing soda.
When baking soda is heated up to high temperatures, it breaks down to become washing soda, water steam, and carbon dioxide.

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This playlist contains videos that are linked to and mentioned in the book The Basics of Homemade Cleaning Supplies: How to Make Lye Soap, Dish-washing Liquid, Dish-washing Powder, and a Whole Lot More. Book 6 of the Homestead Basics Series