Does Baking Soda Need a Kosher‑for‑Pesach Hechsher?
Question
Baking soda has a regular kosher hechsher, but it does not have a special kosher‑for‑Pesach certification. Can I still use it for Pesach?
Answer
Yes. 100% pure baking soda [in contrast to baking powder] has no concern of chametz whatsoever and does not require kosher‑for‑Pesach certification. It may be used on Pesach without any special hechsher, provided it is plain baking soda with no additives.
Explanation:
Baking soda is sodium bicarbonate, a single, pure, inorganic chemical compound produced from mineral sources and carbon dioxide, with no grain origin, no fermentation, and no ability to become chametz, which is why 100% pure baking soda does not require a kosher‑for‑Pesach hechsher and is not meaningfully affected by being processed in a factory that also handles chametz products, since it is chemically stable, non‑absorptive, and not a food mixture; baking powder, by contrast, is a blended product that contains baking soda plus acidic salts and usually cornstarch as a drying agent, meaning it often involves kitniyot or grain‑related components and processing aids, which creates real Pesach concerns and therefore typically requires specific kosher‑for‑Pesach certification, making baking soda inherently different both scientifically and halachically from baking powder despite their similar culinary uses.
