Earth Metal
Posted By admin on February 25, 2010
Earth Metal
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Can an alkaline earth metal combine with carbon in a binary compound?
formation of carbides in alkaline eath metals----
when beryllium oxide is heated with carbon a brick red coloured carbide of formula Be2C is formed....
2BeO + 2C ------>Be2C + 2CO
it is an ionic compound and reacts with water forming methane...
Be2C + 4H2O -------> Be2C + 4H2O --------> 2Be(OH)2 + CH4
rest of alkaline earth metals (Mg,Ca,Sr, and Ba) form carbides of general formula MC2 either when the metal is heated with carbon in an electric furnace or when their oxides are heated with carbon..
Ca + 2C (at 1375 K)-----> CaC2
CaO + 3C (at 2275 K) -------> CaC2+ CO
all these carbides react with water forming acetylene gas..
CaC2 + 2H2O -----> HC=-HC + Ca(OH) (=- is sign for triple bond)
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