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Solubility Rules

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Solubility rules are an empirical classification scheme naming which ionic compounds are generally soluble or insoluble in water.

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All common nitrate salts are soluble, but most common carbonate salts, apart from the group 1 metals and ammonium, are insoluble.

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Skipping a listed exception, such as ammonium among carbonates, misapplies a solubility rule as if it had none.