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Sodium silicide (NaSi, Na2Si, Na4Si4) is a binary inorganic compound consisting of sodium and silicon. It is a solid black or grey crystalline material.
Sodium silicide reacts readily with water yielding gaseous hydrogen and aqueous sodium silicate in an exothermic reaction (~175 kJ·mol−1):
2 NaSi + 5 H2O → 5 H2 + Na2Si2O5This is used in hydrogen technologies to generate hydrogen as a fuel.
References
Sodium silicide Wikipedia(Text) CC BY-SA