\(M_x + M_z = 96\)
→ X: NaOH (M=40), Z: NaHS (M=56)
\(NaCl + 2H_2O\) (đpdd có màng ngăn) \(\rightarrow 2NaOH (X) + Cl_2 + H_2\)
\(2NaOH_{du}+ H_2S \rightarrow Na_2S (Y) + 2H_2O\)
\(Na_2S + H_2S \rightarrow 2NaHS (Z)\)
\(NaHS + NaOH\rightarrow Na_2S (Y)+ H_2O \)