A certain weight of pure is made to react completely with 200 mL of an solution to give 224 mL of ga — Redox Reactions and Volumetric Analysis Chemistry Question

💡 Solution & Explanation

224 mL of $CO_2$ at STP = 0.01 moles. From stoichiometry ($CaCO_3 + 2HCl \rightarrow CaCl_2 + H_2O + CO_2$), 1 mole of $CO_2$ requires 2 moles of $HCl$. Therefore, 0.01 moles of $CO_2$ requires 0.02 moles (which is 0.02 equivalents) of $HCl$. Thus, $Normality \times Volume(L) = Equivalents \Rightarrow N \times 0.2 = 0.02 \Rightarrow N = 0.1 N$.