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Hydrous oxides of polyvalent metals are widely used as synthetic ion exchangers due to their ability to interact with various ions, making them effective in separating specific ions from solutions. These oxides are often formed by the precipitation of metal salts in the presence of water, leading to a gel-like structure. The _____ _________ _______ ____ ________ __________ _________ ______ _______ _____ ______.
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