Any Substitutions for White or Cider Vinegar? 10 points?!
Answers:
You need the acid to react with the baking soda to form bubbles. The bubbles will make it cake instead of a hard lump.
You can substitute orange juice for the vinegar. Or you can substitute baking powder for the baking soda. Baking powder contains its own powdered acid and will react when put into water.
If the baking powder is more than a year old, it probably has already absorbed enough moisture from the air that it will not longer work.
I don't know what recipe you are using but usually its used because it reacts with the other ingredients. either makes it fluffier or changes the taste a little, sometimes in chocolate cakes to cut the denseness. If you've got something acidic at all like lemon juice, sour cream, or buttermilk that could work.
Lemon juice or white wine, using twice the amount that of what's called for in vinegar in the recipe.