Baking powder from vinegar & baking soda

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equivalent of 1 teaspoon baking powder
1/4 teaspoon baking soda
1 teaspoon vinegar

equivalent of 2 teaspoons baking powder
1/2 teaspoon baking soda
2 teaspoons vinegar

equivalent of 1 tablespoon baking powder
3/4 teaspoon baking soda
1 tablespoon vinegar