DoomsdaysCWBasically, if it fizzes when exposed to something acidic, it's good! Also, old #BakingSoda can still be used for household cleaning or deodorizing fridges.
How to Tell if Your Baking Soda Has Gone Bad—and Why it Matters
This pantry powerhouse can lose its potency, but there's an easy way to tell if it's time to replace it.
By Ellen Morrissey
Published on May 29, 2026
"We've all stared down that orange box at the back of the fridge, wondering whether it's still up to snuff, or wait, does baking soda go bad? Yes, this pantry powerhouse, an essential go-to for sweet and savory culinary preparations, laundry, deodorizing, and more, does lose its efficacy when it gets old. Luckily, there is an easy way to determine whether your baking soda needs to be replaced—and numerous ways to use it up once it is no longer useful for cooking and baking. "
Learn more:
https://www.marthastewart.com/how-to-tell-if-baking-soda-has-gone-bad-11983186