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if you use old baking powder, the cake will not rise properly. To test the baking powder to see if its still good, put one teaspoon of baking powder in a glass, add a little water, if it foams real good, you can use it, otherwise throw it out and get new.

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Wiki User

14y ago
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Wiki User

14y ago

Since baking soda is both water soluble and non-toxic, you are free to wash it away down your sink or toilet.

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Wiki User

13y ago

In the trash.

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Anonymous

Lvl 1
3y ago

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Q: How do you dispose of old baking powder?
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