Baking Soda as Alkalinity and PH Buffer

Fact check:

My ph/dKH are a little low, and I've been toying with the idea of using baking soda to buffer. Someone please confirm if I get this right, because I've read a few different posts, and the info is opposite.

"Baked" baking soda, ie, sodium carbonate, will increase dKH. Regular baking soda, ie, sodium bicarbonate, will increase ph.

NOW, do I mix 4 parts sodium carbonate to 1 part sodium bicarbonate, or is it the other way around?

 

I used baking soda as is to raise Alk/PH for a long time and it worked well for me.
I dosed it with four tablespoon's to a gallon of RO/DI water about once or twice a month. I didn't bake the soda first either due to a low PH problem with my source water. I used all the brand name stuff before I switched to baking soda. Baking soda works in my book.