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Many people keep a box of baking soda in their fridge to neutralize lingering odors. But why is this simple white powder so effective?
Chemically, baking soda is sodium bicarbonate (NaHCO₃), composed of one atom each of sodium, hydrogen, and carbon, and three atoms of oxygen. Its weak amphoteric nature allows it to act as both a mild base and a mild acid, neutralizing acidic or alkaline odor molecules found in spoiled fish, sour milk, and more.
Typically, a box of baking soda can neutralize fridge odors in two days or more; stronger smells require longer exposure. A thorough fridge clean before placing the box can accelerate the effect.
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While the refrigerator is the most common spot, baking soda works wonders elsewhere in the kitchen. Sprinkle a handful at the bottom of your dishwasher between loads; it will absorb odors and boost cleaning power for the next cycle. Pour a splash into kitchen or bathroom drains with warm water, and sprinkle it between trash or recycling layers to keep garbage bins fresh.
Beyond the kitchen, combine baking soda with air purifiers to tackle house odors. Spread it on carpets, rugs, and upholstery to absorb lingering smells. It also eliminates pet odors from bedding and litter boxes and can serve as a dry bath for animals.
In laundry, drop a handful into the wash to reduce foul scents, or add about ½ cup to the rinse cycle for an extra fresh touch.
In the bathroom, baking soda is more than a rug deodorizer. Mix ½ to 1 teaspoon with 4 ounces of warm water for a natural mouthwash that neutralizes bad breath. A mixture of three parts baking soda to one part water—or liquid hand soap—cleans away body odors.
