The pH of Baking soda (Sodium bicarbonate NaHCO3) in pure water is pH 8.2 See link below.
Baking powder is a base since its pH level is somewhere between 8 and 8.5.
No, at pH = 8 (tap water pH) no CaCO3 will precipitate at normal tap water temperature. pH of sodium bicarbonate (baking powder) is also 8.
Baking Powder is a proprietary mixture of ingredients, including an alkaline (base) baking soda (base) and acid powder(s) like cream of tartar, MCP and SAS, and often a stabilizer like cornstarch (acid to neutral). Because the PH of a powder is measured when mixed with water, and usually one or more of the acids aren't soluble at room temperature, baking powder will turn from an alkaline to neutral when cooked with a liquid. This chemical reaction causes the release of CO2, which is why my bread has these little holes that makes it so fluffy.
Baking Powder
Baking powder in a recipe helps your item rise when baking.
baking powerder is baking powder is not the same!
baking powder
Not sure what the question is asking.Baking soda cannot replace baking powder. Baking powder will raise a batter by itself; baking soda requires additional ingredients with which to react and raise the batter.For a homemade recipe for baking powder, see here: http://frugalliving.about.com/od/condimentsandspices/r/Baking_Powder.htmAn additional note: baking powder will go bad over time, so if your recipes are turning out flat instead of fluffy, try getting some new baking powder.
Odors usually stem from acidic substances (more than likely lactic acid in the fridge). Sometimes they can come from less acidic and more alkaline substances like rotten meat. What baking soda does is neutralize the pH of these odors. Baking soda is pure bicarbonate which lowers the pH acidic substances and raises the pH in alkaline substances. Since odors are acidic and basic (meaning the pH level is either high or low, respectively), neutralizing their pH masks the odor. The odor is technically still there, but now the odor's pH level is neutral, making it to where you cannot smell it anymore.
Baking soda does not rise as well as baking powder
No, baking powder does not absorb odors when used in baking.