Write reaction schemes (unbalanced equations showing all reagents and products) for a synthesis of a compound...

Question

Question

Write reaction schemes (unbalanced equations showing all reagents and products) for a synthesis of a compound with a hydride (H^1- ) ion.

Answer 1

Answer #1

One example of a compound containing hydride ion or H-1 i.e. is lithium hydride or LiH.

It can be synthesised directly treating lithium meta and with hydrogen gas at a rapid temp. above 6000c temperature.

The reaction is

2Li+H2 2LiH above 6000c

Then

LiAlH4 can be prepared from the reaction between lithium hydride (LiH) and aluminium chloride AlCl3 .

4 LiH + AlCl3 → LiAlH4 + 3 LiCl

There is another method of preparation of lithium aluminium hydride is from sodium aluminium hydride which is also a hydride compound.

First prepare Sodium aluminium hydride from sodium,aluminium and hydrogen.

Na + Al + 2 H2 → NaAlH4

LiAlH4 is then prepared by a salt metathesis reaction i.e.sodium aluminium hydride and lithium chloride

NaAlH4 + LiCl → LiAlH4 + NaCl

Answer 2

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