Sūdáfěn hé pàodǎfěn bú shì yì huí shì, zuò dàngāo shí bié fàngcuò le.
Baking soda and baking powder aren't the same thing, so don't mix them up when you bake a cake.
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苏打粉 is the same as 小苏打, sodium bicarbonate. Baking powder is 泡打粉 or 发酵粉: it already contains an acid, while baking soda needs an acidic ingredient such as yogurt or vinegar to make dough rise.