Question: how to replace 1/2 tsp of baking powder?
Answer: To replace 1 teaspoon (5 grams) of baking powder, use 1/4 teaspoon (1 gram) baking soda and 1/2 teaspoon (2.5 grams) lemon juice. Summary: Replace 1 teaspoon (5 grams) of baking powder with 1/2 teaspoon (2.5 grams) lemon juice and 1/4 teaspoon (1 gram) baking soda.