"Soda extract" is a bit of a misleading term. There isn't a specific ingredient called "soda extract". It's likely you're thinking of one of two things:

1. Sodium bicarbonate (baking soda): This is a common leavening agent used in baking. It's not an "extract" in the traditional sense, but it does react with acidic ingredients to produce carbon dioxide, which helps cakes and other baked goods rise.

2. Extracts made from soda fruits: Some extracts, like soda water extract, are made from the soda fruit (also known as the soda apple or soda plant) and are used in flavoring beverages and desserts. This extract has a slightly sweet and sour flavor with a hint of citrus and is sometimes used as a substitute for lemon extract.

If you are looking for a specific ingredient, please provide more context. For example, are you looking for a baking ingredient, a flavoring extract, or something else? Knowing what you are looking for will help me give you a more accurate answer.