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Odors usually stem from acidic substances (more than likely lactic acid in the fridge). Sometimes they can come from less acidic and more alkaline substances like rotten meat. What baking soda does is neutralize the pH of these odors. Baking soda is pure bicarbonate which lowers the pH acidic substances and raises the pH in alkaline substances. Since odors are acidic and basic (meaning the pH level is either high or low, respectively), neutralizing their pH masks the odor. The odor is technically still there, but now the odor's pH level is neutral, making it to where you cannot smell it anymore.

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15y ago

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