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1.Ni(NO3)2+2NaOH → Ni(OH)2↓+ 2NaNO3(выпадение осадка)
Ni(2+)+2NO3(-)+2Na(+)+OH(-)→ NiOH↓+2Na(+)+2NO3(-)
Ni(2+)+OH(-)→NiOH↓
2.FeCl3+3KOH→Fe(OH)3↓+3KCl(выпадение осадка)
Fe(3+)+3Cl(-)+3K(+)+3OH(-)→Fe(OH)3↓+3K(+)+3Cl(-)
Fe(3+)+3OH(-)→Fe(OH)3↓
3.CuSO4+2KOH=Cu(OH)2+K2SO4(образование осадка)
Cu(2+)+SO4(2-)+2K(+)+2OH(-)=Cu(OH)2↓+2K(+)+SO4(2-)
Cu(2+)+2OH(-)=Cu(OH)2↓
4.K2CO3+2HCl→2KCl+H20+CO2↑(выделение газа)
2K(+)+CO3(2-)+2H(+)+Cl(-)→2K(+)+2Cl(-)+H20+CO2↑
CO3(2-)→CO2↑+H20
5.K2S+2HNO3→2KNO3+H2S↑(выделение газа)
2K(+)+S(2-)+2H(+)+2NO3(-)→2K(+)+2NO3(-)+H2S↑
2H(+)+S(2-)=H2S↑
6.H2SO4+2KOH=K2SO4+2H20(образование слабого электролита)
2H(+)+SO4(2-)+2K(+)+2OH(-)=2K(+)+SO4(2-)+2H20
2H+2OH=2H20
H+OH=H20