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'''Hydrate'''- an ionic substance that has a certain number of water molecules bounded to it (it is assumed that it is one moleule of the ionic compound). Bound does not mean chemically bonded (shared valence electron) but simply held near each other due to coulombic force. <br> <b>Anhydrous</b> - it is the hydrate without the water so it really is only the ionic compound.<br> '''Percent Hydrate''' = (mass of H<sub>2</sub>0 / mass of total sample) x 100% '''''Example''''' Ferric chloride hexahydrate (<nowiki>FeCl</nowiki><sub>3</sub> x 6H<sub>2</sub>0) Answer: Mass of sample = 55.85g Fe + 3(35.45g Cl) + 12(1.008g H) + 6(16.00g O) = 270.296g <nowiki>FeCl</nowiki><sub>3</sub> x 6H<sub>2</sub>0 Percent Hydrate = (12(1.008g H) + 6(16.00g O)/270.296g <nowiki>FeCl</nowiki><sub>3</sub> x 6H<sub>2</sub>0) x 100% = 39.9917 = 40.0%
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