Bath bomb question
I'm confused about the proportions of baking soda to citric acid in recipes and how it affects the finished product.
For example, Marie Browning's Basic Recipe calls for 1 cup baking soda to 3/4 cup citric acid. She gives another recipe that is 1 cup baking soda to 1/2 cup citric acid and 1/4 cup cornstarch.
Hazel's recipe, (the one I'm thinking I'll use since she knows what she's talking about,) calls for 2 cups baking soda to the same 3/4 cup citric acid.
Does the proportion affect the fizzing action substantially? Or the water softening effect of the salts?
(I also like Hazel's suggestion of adding a drop of two of scent after they've dried a bit to give them more oomph.)