jrslady is correct! I have kept my baking soda & powder in the freezer for years. It's a shame to go to all the trouble to bake a scratch recipe and have all your hard work ruined for lack of storing your ingredients properly. I also store my Bisquick,flours and cornmeal in the freezer.
I never throw baking soda away. I actually wind up storing it if it goes bad and using it as a face scrub (with handsoap) or to scrub the sink/bathtub with. The gritty texture works really well even when the always useful chemical has gone away!
Pamphyila - Baking Powder loses it's potency over time - I know, I've thrown my share of unused baking powder out. Small tip: To find out if baking powder is still usable: Put a very small amount in a very small amount of water. If it bubbles, it's still good. If it doesn't bubble, throw it out, it's no longer a working baking powder.
Pardon me - but whay would you want to freeze it? Isn't it a chemical mixture? My mother always kept it on the shelf - me, too - I don't think you have to treat it with much care- maybe put it in a can or jar???
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