The equivalent mass of CaCO₃

Molecular mass of CaCO₃ is 100 and n-factor is 2 as CaCO₃ is dissociates as ${\mathrm{Ca}}^{2+} \mathrm{and} {\mathrm{CO}}_3^{2-}.$

$\mathrm{Equivalent} \mathrm{weight}=\frac{100}{2}=50$