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A desiccant absorbs and holds water, drying out the environment around it. Baking soda, or sodium bicarbonate, separates into it's ion forms. The sodium acts to draw the water in while the bicarbonate ion reacts with the water to form carbonic acid and a hydroxide ion. The baking soda will continue this process until saturated, i.e. the reaction of water with bicarbonate ion reaches equilibrium.

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12y ago

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