Is their a substitute for Baking soda?? I'm doing a vegan cake...and just noticed that I have no baking soda left?
Baking Soda (Sodium Bicarbonate)
(Rule of Thumb: 1/4 teaspoon for every 1 cup of flour)
1/2 teaspoon 2 teaspoons double-acting baking powder (must replace the acidic liquid in recipe with non-acidic liquid)
1/2 teaspoon potassium bicarbonate
here's a site with substitutions to help you in the future: http://www.joyofbaking.com/IngredientSubstitution.html
you could give baking powder a try - are you using vinegar to help with the levening? ; according to a q&a on the food network site:
Baking powder is similar to baking soda, though it's about a quarter as strong, and it's mixed together with exactly the right proportion of acid in order for it to activate.
Thank you guys with all the help!