I have a question regarding the solubility of baking soda (bicarb soda) in oil. I am pretty sure that it has poor solubility, but I have a chemistry dilemma and cannot seem to solve it.
I make all-natural deodorant, and the main ingredients are coconut oil, shea butter and baking soda (amongst a few other ingredients). We have been making it for years, and it was always soft and smooth, but this time the baking soda is not dissolving and leaves a gritty texture (even after sifting baking soda to remove lumps).
Does anyone have any idea why this might be? We heat the ingredients to melting point on the stove, then let cool to room temperature and re-solidify in the fridge for a day, before using.
The only thing I can think of is that we have recently changed to a new brand of baking soda; however, with adequate mixing, surely that would not change the final texture so much.