| 1. | The tetrahydrate loses water when heated to 180-200 �C.
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| 2. | A tetrahydrate NiCl 2 ?H 2 O is also known.
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| 3. | The tetrahydrate can exist in two structures, or polymorphs.
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| 4. | It a colorless solid, typically obtained as the tetrahydrate.
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| 5. | The tetrahydrate occurs in nature as the mineral Earlandite.
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| 6. | A light green tetrahydrate is also known, which is highly soluble in water.
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| 7. | Both the trihydrate and tetrahydrate are available commercially.
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| 8. | Both the trihydrate and tetrahydrate are known.
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| 9. | The tetrahydrate cobalt ( II ) fluoride is formed by dissolving cobalt ( II ) in hydrofluoric acid.
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| 10. | The tetrahydrate can be prepared by dissolving iron in warm hydrated hydrofluoric acid and precipitating the result by addition of ethanol.
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