a)K2SO4 -> 2K+ + SO4^2-CuSO4 -> Cu^2+ + SO4^2-AI2(SO4)3 -> 2Al^3+ + 3SO4^2-
б)FeCl3 -> Fe^3+ + 3Cl-Fe(NO3)3 -> Fe^3+ + 3NO3-Fe2(SO4)3 -> 2Fe^3+ + 3SO4^2-
a)
K2SO4 -> 2K+ + SO4^2-
CuSO4 -> Cu^2+ + SO4^2-
AI2(SO4)3 -> 2Al^3+ + 3SO4^2-
б)
FeCl3 -> Fe^3+ + 3Cl-
Fe(NO3)3 -> Fe^3+ + 3NO3-
Fe2(SO4)3 -> 2Fe^3+ + 3SO4^2-