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Depends on how it's stored. In a well sealed air tight container it'll last pretty much indefinitely. If it's not well sealed, it'll absorb moisture and smells from its surroundings, which will make it both icky and ineffective as a raising agent, but it probably won't kill ya!

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14y ago
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15y ago

Once a can is opened, fresh baking powder should be good for 3 to 6 months.

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16y ago

6-12 months

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Q: How long does opened baking powder last?
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How long does baking power last?

Generally baking powder will last for six months to one year.


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For a good long time if it is kept properly stored. Here is a test you can use to make sure your baking powder is usable . Put water in a teaspoon and sprinkle a little bit of the baking powder in the water. If your baking powder is good the water will fizz sort of like a soda does. if you don't hear or see the fizz then baking powder is no good and should be tossed out.


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As long as its not made with powder sugar. Are you baking a cake?


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Only substitute baking soda for baking powder if the cookie dough will be baked within 30 minutes of mixing. Baking soda begins to lose potency as soon as it gets wet so baking powder is used when the dough will be allowed to sit for a long time before baking.


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Baking soda is not hazardous. Infact let it on ur skin for how ever you please.


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