1 g of pure calcium carbonate was found to require 50ml of dilute HCl for complete reaction.the strength of the HCl solution is given by

CaCO3 + 2HCl  CaCl2 + H2O + CO21 g of CaCO3 requires 50 ml of dil HCl. The normality of 50 ml HCl required for this reaction is  = Weight of CaCO3 given / Eq massvolume of the solution in L        = 1/500.05 [ vol of HCl = 50 ml = 0.05 L)   = 0.4 N

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