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COMPLEX
HYDRIDES
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INTRODUCTION
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| Hydrides of group I-A and the group III-A are combined to form complex hydrides. Complex hydrides contains all three types of bonds. | ||||
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GENERAL
FORMULA
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MAH4 Where M= element of of I-A group. A= element of III-A group. |
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EXAMPLES
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| LiAlH4, NaAlH4, LiGaH4 etc | ||||
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PREPARATION
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LiH + AlH3 è LiAlH4 NaH + GaH3 è NaGaH4 LiH + GaH3 è LiGaH4 |
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IONIZATION
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They ionize as M+ and AH4- LiAlH4 è Li+ + AlH4- NaAlH4 è Na+ + AlH4- |
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PROPERTIES
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They are soluble in water. They are thermally stable upto 300C. They are solids. They are white in colour. They are reducing agent. |
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REACTION
WITH WATER
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| Complex hydrides when treated with water, two hydroxides are obtained with the liberation of hydrogen gas. | ||||
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NaAlH4 + 4H2O
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NaOH + Al(OH)3 + 4H2
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