The number average molecular weight (Mn) of polyethylene glycol (PEG) can be determined in the following manner: (i) a sample of PEG is combined with excess phthalic anhydride and imidazole, and the mixture is allowed to react completely; (ii) once the reaction is complete, H2O is added to the mixtures; (iii) the mixture is titrated with NaOH.

Idk the answer sorry

Perimeter? wheres the answers

I’m not sure about this question

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 -