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Bicarbonate of soda, also known as baking soda or sodium bicarbonate, is a versatile leavening agent and ingredient in many recipes. This fine, white powder is an alkaline compound that, when combined with an acid like vinegar, lemon juice, or buttermilk, produces carbon dioxide gas. This gas creates bubbles in baked goods, causing them to rise and become light and airy. Bicarbonate of soda also has other uses around the kitchen and home, including neutralizing odors and acting as a gentle abrasive cleaner.

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Bicarbonate of soda (baking soda) should be stored in an airtight container in a cool, dry place away from moisture and strong odors. A pantry or cupboard works well. Ensure the container is sealed tightly after each use to prevent it from absorbing moisture or smells from the surrounding environment. Properly stored, it can last for an extended period, even past its expiration date, though its leavening power may diminish over time.