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Rezolvati : a+H2O------>NaOH +H2
NaOH+b---->NaCl+H2O
NaCl+d----->NaSo4+Hcl
Na2SO4+BaCl2------>e+NaCl
(da stiu lipseste c dar asa e in carte , va rog rpddd am nevoie de el pls ,dau coroana)