SODIUM HYDRIDE NaH

Properties of Sodium hydride NaH:

White. Decomposes when heated, under hydrogen pressure melts without decomposition. A strong reducing agent, reacts with water, acids, ammonia and oxygen.


Obtaining Sodium hydride:

2Na + H2 = 2 NaH (250-400°C, pressure).

2Na2[ReH9] = 4 NaH + 2 Re + 7H2 (245°C).


Reactions with Sodium hydride:

2NaH = 2Na + H2 (430-500°C, vacuum).

NaH + H2O = NaOH + H2↑.

NaH + HCl (diluted) = NaCl + H2↑.

2NaH + O2 = 2 NaOH (t>230°C).

NaH + Cl2 = NaCl + НСl (450-500°C)

2NaH + 2 S = Na2S + H2S (350-400°C).

2NaH + 4C (graphite) = Na2C2 + C2H2 (350°C).

NaH + CO2 = Na(HCOO) (until 200°C, pressure).

2NaH + 2 SO2 = Na2SO4 + H2S (200-250°C).

4NaH + AlCl3= Na[AlH4] + 3NaCl (in ether).

2NaH + (FeIIFe2III)O4 = 4NaOH + 3Fe (350-420°C).

2NaH + TiCl4 = Ti + 2NaCl + 2HCl.

NaH + NH3 (gas) = NaNH2 + H2 (350°C).
 

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Natural gas has no odour. The smell is added artificially so that leaks can be detected.