No, powder cannot be used instead of soda as they are two different substances with different chemical properties and functions in various applications, including baking and cooking. Baking soda, or sodium bicarbonate, is a leavening agent that helps in rising baked goods. On the other hand, powder or baking powder contains a mixture of baking soda, acid, and cornstarch, which not only helps in rising baked goods but also provides extra fluffiness and tenderness to the texture. Hence, substituting one for the other may negatively affect the final outcome of the recipe.