1) An extra strength antacid tablet contains 750 mg of active ingredient, CaCO3. If it takes 22.25 mL of HCl(aq) to neutralize the tablet, how strong is the acid? 2 HCl (aq) + CaCO3 (aq) - CaCl2(aq) + HOH (1) + CO2 (g)

It would be true sodium reacts with water in a violent way 

Reaction type : double replacement hcl + lioh = h2o + licl

Answer is: the equilibrium  shifts toward the reactants, to the left side of chemical reaction.it is because lead(ii) nitrate dissociates in water: pb(no₃)₂ → pb²⁺(aq) + 2no₃⁻(aq).according to lechatelier's principle, the position of equilibrium moves to counteract thechange (more lead cations, common ion), the position of equilibrium will move so that the concentration ofproducts decrease and concentration of reactants of chemical reaction increase.read more on -