[latex]2NH_4OH+ZnCl_2--- extgreater Zn(OH_2)downarrow+2NH_4Cl\ 2NH_4^++2OH^-+Zn^{2+}+2Cl^---- extgreater Zn(OH)_2+2NH_4^++2Cl^-\ Zn^{2+}+2OH^---- extgreater Zn(OH)_2\\ 3MgBr_2+2Na_3PO_4--- extgreater Mg_3(PO_4)_2downarrow+6NaBr\ 3Mg^{2+}+6Br^++6Na^++2PO_4^{3-}-- extgreater Mg_3(PO_4)_2downarrow+Na^++6Br^-\ 3Mg^{2+}+2PO_4^{3-}--- extgreater Mg_3(PO_4)_2downarrow\\ 2NaOH+Pb(NO_3)_2--- extgreater Pb(OH)_2downarrow+2NaNO_3\ 2Na^++2OH^-+Pb^{2+}+2NO_3^---- extgreater Pb(OH)_2downarrow+2Na^++2NO_3^-\ Pb^{2+}+2OH^---- extgreater Pb(OH)_2[/latex]
