Baking Soda, Baking Powder

Opinions vary about how long baking soda and baking powder will keep once they've been purchased.
Some experts have gone so far as to characterize their "sell by" or "use by" dates as arbitrary. Though these products aren't subject to spoilage, both may eventually fail to rise to the occasion as leavening agents for baked goods.
Baking Soda and Baking Powder Shelf Life
Baking Powder18 months
Baking Soda2 years
Handling Tips: 
Keep dry and covered.
Boyer, Renee, and Julie McKinney. "Food Storage Guidelines for Consumers." Virginia Cooperative Extension (2009): n. pag. Web. 7 Dec 2009.

"Cupboard Storage Chart." K-State Research and Extension n. pag. Web. 23 Dec 2009. <>.

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