Viết PTHH: a, NaOH (1) -> Na2SO4 (2) -> NaOH (3) -> Cu(OH)2 (4) -> CuO b, ZnSO4 (1) -> ZnCl2 (2) -> Zn(OH)2 (3) -> ZnO (4) -> Zn (NO3)2 c, Cu(OH)2 (1) -> CuSO4 (2) -> Na2SO4 (3) -> NaCl (4) -> NaNO3

Đáp án: dưới nha

Giải thích các bước giải: a, 2NaOH+H2SO4=Na2SO4+2H2O; Na2SO4+Ba(OH)2=BaSO4+2NaOH; 2NaOH+CuSO4=Na2SO4+Cu(OH)2; Cu(OH)2=CuO+H2O. b, ZnSO4+BaCl2=ZnCl2+BaSO4; ZnCl2+2NH3+2H2O=Zn(OH)2+2NH4Cl; Zn(OH)2=ZnO+H2O; ZnO+2HNO3=Zn(NO3)2+H2O. c, Cu(OH)2+H2SO4=CuSO4+2H2O; CuSO4+Na2CO3=CuCO3+Na2SO4; Na2SO4+BaCl2=2NaCl+BaSO4; NaCl+AgNO3=AgCl+NaNO3