1) Сu(OH)2, CaCO3
2) Ca(+2), Zn(+2)
3) Ca(NO3)2, CaSO3, Zn(NO3)2, ZnSO3
4) 2HCl+Ba(OH)2=BaCL2+2H2O
2H(+)+2Cl(-)+Ba(+2)+2OH(-) = Ba(+2)+2Cl(-)+2H2O
2H(+)+2OH(-)=2H2O
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Answers & Comments
1) Сu(OH)2, CaCO3
2) Ca(+2), Zn(+2)
3) Ca(NO3)2, CaSO3, Zn(NO3)2, ZnSO3
4) 2HCl+Ba(OH)2=BaCL2+2H2O
2H(+)+2Cl(-)+Ba(+2)+2OH(-) = Ba(+2)+2Cl(-)+2H2O
2H(+)+2OH(-)=2H2O