Bicarbonate of soda or sodium bicarbonate is another term for baking soda. Baking powder is a combination of sodium bicarbonate and cream of tartar or tartaric acid to make baking easier. You just have to have one can instead of both.
I happen to keep all three ingredients in my baking shelf. Putting an acid like lemon juice in baking soda, an alkaline substance, just makes a fizzy mess. Try it in a dish and see what happens.
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