Viết các phương trình phản ứng sau đây dưới dạng đầy đủ rồi suy ra phương trình ion rút gọn:
a) \(NH_4F+NaNO_2\xrightarrow[]{t^{\circ}}...\)
b) \(FeCl_2+KMnO_4+H_2O\xrightarrow[]{}...\)
c) \(MnO_2+HCl_{\text{(đặc)}}\xrightarrow[]{t^\circ}...\)
d) \(NaCl+H_2O\xrightarrow[cmn]{đpdd}...\)
e) \(CH_3COONa+NaOH\xrightarrow[CaO]{t^\circ}...\)
a) \(NH_4F+NaNO_2\xrightarrow[]{t^\circ}NaF+N_2\uparrow+2H_2O\)
Ion RG: \(NH_4^++NO_2^-\xrightarrow[]{t^\circ}N_2\uparrow+2H_2O\)
b) \(9FeCl_2+3KMnO_4+6H_2O\rightarrow5FeCl_3+4Fe\left(OH\right)_3\downarrow+3KCl+3MnO_2\downarrow\)
Ion RG: \(9Fe^{2+}+3MnO_4^-+6H_2O\rightarrow5Fe^{3+}+4Fe\left(OH\right)_3\downarrow+3MnO_2\downarrow\)
c) \(MnO_2+4HCl\text{ (đặc)}\rightarrow MnCl_2+Cl_2\uparrow+2H_2O\)
Ion RG: \(MnO_2+4H^++2Cl^-\rightarrow Mn^{2+}+Cl_2\uparrow+2H_2O\)
d) \(2NaCl+2H_2O\xrightarrow[cmn]{đpdd}2NaOH+H_2\uparrow+Cl_2\uparrow\)
Ion RG: \(2Cl^-+2H_2O\xrightarrow[cmn]{đpdd}2OH^-+H_2\uparrow+Cl_2\uparrow\)
e) \(CH_3COONa+NaOH\xrightarrow[CaO]{t^\circ}Na_2CO_3+CH_4\uparrow\)
Ion RG: \(CH_3COO^-+OH^-\rightarrow CO_3^{2-}+CH_4\uparrow\)