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wrote:
> Since I use it so seldom, I have the better part of a can of baking
> powder in the fridge that reached its expiration date a while ago.
>
> Is there a way of proofing it the way you proof yeast by adding it to
> warm water? Maybe adding a little to an acid, such as vinegar or lemon
> juice to see if it bubbles?
>
> I like to experiment.

You don't even need acid, just warm-hot tap water. Put a teaspoon of
powder in about a quarter cup of water (no need to measure; I'm just
giving approximates). It should bubble up.

I've never heard of storing baking powder in the fridge. Be sure you're
not mixing up baking powder with baking soda. If you've been using
baking soda to absorb odors in the refrigerator, throw it out and buy
new for baking.

--Lia