one gm of a metal carbonate gave 0.56g of its oxide on heating.Determine the equivalent weight of the metal.

let metal carbonate be : MCO₃  and metal oxide is MO

MCO₃ ---->  MO      +    CO₂

1gm           0.56g

so the oxide is CaO (M.wt = 56) and metal carbonate is CaCO₃ (M. wt = 100)

metal is Ca (M.wt = 40) and metal ion is Ca⁺⁺

its eq. wt ( 40 /2 ) = 20

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Naga Ramesh
IIT Kgp - 2005 batch
 

Please refer to the answer of Mr. Ramesh. If the metal X is considered and the weight of the metal is M gm then the equivalent weight of the metal X would be M/2 as the definition of equivalent weight suggests that the weight of the metal that combines with 8 parts of Oxygen is the equivalent weight of that substance.

Please note that the atomic weight of Oxygen is 16 gm.

JAGABANDHU PANDA

IIT Delhi