Question 9.15 Saline hydrides are known to react with water violently producing fire. Can CO2, a well known fire extinguisher, be used in this case? Explain.
Class XI Hydrogen Page 289
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saline hydrides ( like NaH, CaH2,KH etc ) react with water violently to form the corresponding metal hydroxide with the evolution of dihydrogen.
e.g., NaH + H2O ---->NaOH + H2↑
CaH2 + 2H2O ---->Ca(OH)2 + 2H2 ↑
These reaction are highly exothermic reaction that the evolved HE catches fire. These type of fire can't be distinguished by CO2 because it gets reduced by the hot metal hydride to form sodium formate.
NaH + CO2 --->HCOONa
e.g., NaH + H2O ---->NaOH + H2↑
CaH2 + 2H2O ---->Ca(OH)2 + 2H2 ↑
These reaction are highly exothermic reaction that the evolved HE catches fire. These type of fire can't be distinguished by CO2 because it gets reduced by the hot metal hydride to form sodium formate.
NaH + CO2 --->HCOONa
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